Give the right information about OST and PST file. Benefit, differences and other aspects of Outlook OST and PST file.

Restoring Outlook Emails from an OST after Deleting the Mailbox

OST to PST Conversion process easily get emails after deleting the mailbox

How to get Outlook emails from OST file?

By use of third party email recovery solution or manually method Outlook client can easily restore Outlook emails from damage or unreadable OST file.

OST to PST Conversion Process

It is a modern technique which can easily repair orphan OST file as well as convert an offline OST file into PST file.

Outlook Oversized OST File Problem

I would like to suggest useful tool to easily split oversized OST file.

Tuesday, 5 December 2017

How to Reduce OST File Size in Outlook

We all are aware of the fact that OST files stand for Offline Storage Table. It is the exact copy of the user’s mailbox on MS Exchange Server saved locally on your machine. The OST files are made for the main purpose like to work offline in absence if MS Exchange Server. It even comprises of entire MS Outlook information till the time of last synchronization.

Why a need arises to reduce OST file size ?

The very first reason behind the reducing OST files size is that sometimes your Outlook mailboxes grow in size and hence you receive or create new items and it makes the OST files so large. The OST file size may decrease in case you have deleted some items. It makes the system slow and thus enhances the system’s speed and also consumes the storage space. So, instead of buying a new disk, it seems to compact Offline Storage Folders.

The moment you delete the Offline Folders Mail, it goes to the deleted items folder. The simple thing is that all the items can be recovered from the deleted item folder; it implies that still some space is consumed by OST files. The very basic fact about the OST file is that the space consumed by them is unavailable for the other uses. It makes the OST files bigger and just bigger over times and even if you delete few of the items or keep the same record in MS Outlook.

Compacting OST files reduces the space allotment that was previously occupied by few items. So, through the method of compact Outlook OST file, some of the previously stored items occupied space can be reduced. Alternatively the users can even convert OST to PST for preventing it from the future corruption issues.

Now, one of the major concerns is how to reduce OST file size in MS Outlook?

For Microsoft Outlook 2007 

1. Delete the items that you don’t want to keep in OST files
2. Empty the deleted items folder
3. Click on File Tab and choose Info Tab 
4. Finally, click on the Account Settings Tab and then hit it again
5. Choose MS Exchange Server Account ID and then click on change option
6. Select More Settings option and then opt for the advance tab and click on Offline folder file settings
7. Finally, click on Compact Now alternative and then click Ok.

For MS Outlook 2010

1. Delete items that you don’t want to store  OST files
2. Empty deleted items folder
3. Click File Menu and then choose Info Tab
4. Click Account Settings Tab and then again click on Account Settings 
5. Select Exchange Server Account ID and then press Change button
6. Click More Settings Alternative
7. Select Advance tab, click on Offline Folder File Storage
8. Select Compact Now and then click Ok 

For Microsoft Outlook 2013
For compacting OST files in Outlook 2013, follow the steps listed below:

1. Delete the items that you don’t want store in OST file
2. Then, empty the deleted items folder
3. Click file and select Info folder
4. Select Account Settings tab and click on Account Settings again
5. Choose MS Exchange Server Account ID and click on Change Button
6. Click More Settings and on Advance tab, click Outlook Data File Settings 
7. Finally, select Compact Now and then click OK button

Note: Make sure that the OST files size is equal or greater than 16 KB. Users may not be able to compact OST files manually in case, the size is completely less than 16 KB. Additionally, this alternative cannot compact corrupted OST files.

Now, the question arises that what will happen if your OST file becomes corrupted because of its large size.
The question has a very simple answer that if OST files exceed the default minimum size, it can cause corruption and then data loss. The compact option doesn’t work in these circumstances because a corrupted OST files can’t be compacted. In such circumstances, making use of a professional tool is the best possible way out. The best way out in these circumstances, Microsoft OST to PST Converter Tool is the best one out. The tool has many brilliant features that differentiates it with other software’s and thus leaves its impact on the users. The tool can be downloaded from its parent website and thus the users can get to know it from every inner section. So, keep connected to the software and compact Offline Storage Folders.

The Final Verdict!
The above mentioned article helps the users with understanding the concept of reducing & compacting OST files in different Outlook versions. So, follow the entire write-up and get your query resolved.

Monday, 16 October 2017

Manual Steps To Perform OST to Office 365 Migration Successfully

OST file if the offline folder of the Outlook data file, which cannot be accessed from anywhere except the Outlook profile which has created it. As everybody knows having data on a cloud platform has many advantages. For example, a user can access the mailbox data from anywhere without any dependency. It works like backup file also in the case of data loss. Therefore, if a user wants to move OST file to Office 365 account, then first convert OST file to PST format. After that, a user can import it to Office 365 account. Hence, in this post, we have discussed manual steps to perform OST to Office 365 migration.

Manual Method to Import OST into Office 365 Account

In order to perform OST to Exchange Online migration, there is no direct manual solution available. Therefore, a user need to perform this migration in two parts i.e., first export Offline OST to Outlook PST format and after that import it to Exchange Online. Now, to perform this migration task in an appropriate way, follow the steps mentioned below:

Manual 1: Use Export Feature of Outlook 

To export files from offline OST to Outlook, follow the steps mentioned below: 
  • First of all, open MS Outlook application 
  • Then, navigate to File >> Export to a file >> Next button 
  • After that, choose Personal File Folder (.pst) option and click on Next button 
  • Now, choose the folder that you want to convert and check the Include subfolders option 
  • In last, select the destination location to save the exported file on the system and click on the Finish button 
Limitation: A user must be connected to MS Exchange Server to perform the above steps.

Manual 2: Use Archive Feature of MS Outlook.
  • Open Microsoft Outlook application on the local machine.
  • After that, click on the File >> Archive option 
  • Then, choose the file or folder that you want to archive 
  • Now, choose the destination to store the archived .pst file 
  • Click on the OK button and begin the archive process 
Limitation: Using this manual solution, a user can migrate complete OST file data except contacts.

Manual 3: Export Offline OST to new PST
  • To begin, open MS Outlook application on the local machine 
  • After that, create a new Outlook Data File (.pst) in the Outlook profile 
  • Now, select the mailbox folders that needs to exported in Outlook PST file 
Limitation: This method does not allow to move inbox, Sent items, Contacts, etc. the default folders to PST file. Therefore, just copy the folder from OST to Outlook PST file.

Step 2: Import PST file to Office 365 Account

After OST to Outlook data file (.pst) conversion, a user needs to import the resultant PST file to Office 365 account. Now, to do the same, a user can use any of the three methods:

Method 1: With the Help of Drive Shipping

A user can use this method to move data to OneDrive for the Business. Initially, a user has to copy the data from PST file data to hard drive (make sure that the hard drive is BitLocker-encrypted). After that, move the drive to the Microsoft data center physically.

Method 2: Using Network Upload Method

In order to transfer or copy Personal Storage Table into Office 365 account in less time, follow the steps given below:
  • First of all, copy SAS URL and then, install the Azure AzCopy 
  • After that, move PST file into Office 365 mailbox 
  • Now, you can view the list of PST files uploaded or saved to Exchange Online (Optional) 
  • Then, create the .pst import mapping file 
  • In last, create a Personal Storage Table import job in the Office 365 
Drawbacks of Manual Procedures

The manual solution is very lengthy and time consuming.
The uploading of PST file takes lots of time and effort in the case of large-sized PST file in bulk.
If any of the steps is not performed properly, there are chances of data deletion or corruption.

Method 3: Third-party Tool to Perform OST to Office 365 Migration

As discussed above, there is no direct manual solution available to import OST to Office 365 account. Moreover, the manual methods discussed have some limitations, which make users switch to some third-party tool for an ideal solution. One such popular tool is OST to Office 365 Converter software. It import OST file to Exchange Online in just a few number of clicks and overcome all the limitations of manual solutions. It is a guaranteed solution to move OST file without any loss of data.

Considering the need of users to import OST file to Office 365, various manual solutions are discussed above. The manual solutions are completely free to use but they are not easy to use and have various limitations. So, to overcome all such drawbacks, a direct solution is also suggested to move OST to Exchange Online.

Monday, 18 September 2017

Cannot Open OST File in Outlook 2016, 2013, and 2010 : Troubleshoot Error

The blog states different causes, which are responsible for “Cannot open OST file in Outlook 2016, 2013, and 2010” problem. This will provide solutions on how to make .ost file accessible. It covers manual as well as automated workaround for the same.

The term OST stands for offline storage table files that acts as a copy of the Exchange server. It permits users to work with Outlook when the Cached Exchange mode is activated. An OST file can only be operated from its primary account, which created it. The offline folder gets generated when Outlook is configured with the Microsoft Exchange server.

There are several advantages of using Outlook OST files. The file not only works as the copy of mailbox folder of the Exchange server but, helps in automatic synchronization made on the Exchange server. When this server gets connected with the client machine, the OST file automatically gets synced and all the mailboxes are added, edited, or deleted when the connection gets re-established. Basically, an OST file renders an ease in continuing functionality even in the server mailbox unavailability.

What Makes OST Files Inaccessible?

There are some known and unknown causes of the problem. Talking about corrupt offline folders then, the program indicates “Cannot Open OST file in Outlook 2016 / 2013 / 2010” error. Apart from this, the application denies using of file and restricts one from working upon it. Well, discussing about an actual reason for the frequent OST Corruption when it is improperly synchronized with the server. This improper functioning is held due to lack of the internet connection. Some of such common issues are provided below :

  1. Damaged offline folder
  2. Power surge 
  3. Malware attacks
  4. Failure over the network
  5. Improper program handling
When users are completely unable to work with OST file, there is no manual tip or trick to regain data back. The only approach left in such case is to opt for OST to PST application.

Note : When this concept of OST file gets implicit, one have to understand the concept of PST file. It is so because a person needs to understand an accurate difference between OST and PST file.

Methods to Fix Error

Approach #1 : Recreate OST Files From Server
The execution of this approach requires backup of Outlook OST file in .pst format. Microsoft team recommended Outlook 2010, 2013, and 2016 users to recreate OST file whenever it gets corrupted. This involves deletion of existing file from the server and then re-creation of the same.

Once you are done with OST file recreation, move items from PST file into a newly created OST file. Now a question arises that how to perform this data transferring? Don’t worry, here is the solution for the same :

  • Navigate towards File >> Open >> Import 
  • Choose Import from another program option and hit on Next
  • A list of options get displayed in which you have to select Outlook data file (.pst) option and hit Next
  • Click on the Browse button and locate towards the path where PST file is exported
  • An Option section will be found in which you have to enable option Do not import duplicates. This is going to eliminate all duplicate items from PST file while data transferring.
  • Click on Next and then under Select destination folder section, choose the folder where data items are to be imported.
  • At last, hit on Next >> Finish button
Approach #2 : Execute the OST Integrity Check Tool
The approach is only applicable for clients who works upon Outlook 2007 and all below versions. Here, one will be using scanost.exe file, which is involving following working steps :

Note : Before proceeding further, close MS Outlook and all programs associated with the same.

  • Click on the scanost.exe utility to start its execution
  • In case, you have set up MS Outlook profile then, software will display a window. Here, you have to choose profile that comprises of damaged .ost file . 
  • Utility will ask you to choose anyone of the two network connectivity issue. Choose Connect option.
  • Depending upon your preferences, choose the accurate option. Well, click on Repair Error option for repairing the error.
Tip : If you will not enable repair error option then, software will not properly resolve the issue. So, do not forget to check the required checkbox    
  • Hit on Begin to command utility that it should start its functionality.
  • Challenges in Manual Approaches
The approaches require technical expertise in Outlook. It is so because if something went wrong then, it is going to affect other programs of the PC.

scanost.exe tool will be handling corruption at very low level. This utility will be unable to solve corruption at major level.  The workaround involves more time in its completion. Since, the procedure is server dependent therefore, it is tedious as well as time-consuming.

Approach #3 : Using OST to PST Converter to Troubleshoot Issue
When manual approaches fail in resolving the error like “Cannot open OST file in Outlook 2016, 2013, and 2010” then, the only measure left is to opt for third party tools. One such application is OST to PST Converter that is a multifaceted product, helping one in converting OST files into PST format. It is 100% guaranteed that tool will definitely fix problem without any data loss and complications. The exporter supports file of unlimited size and works upon any level of file corruption.

Observational Verdict
The major cause of “Cannot open OST file in Outlook 2016, 2013, and 2010” problem comprises is .ost file corruption. This means that users have to deal with corrupt OST file to get rid off this issue. Users can leverage for manual approaches only if they are ready to suffer from data loss. If not then, benefit yourself by using OST Repair Tool for resolving issue without any data integrity risk.

Friday, 13 May 2016

Why We Need To Convert OST Files To Outlook PST?

Most of the users of MS Outlook are quite aware of two types of file formats i.e. OST and PST files. PST files (Personal Storage Table) are the main storehouse of all the data stored in Outlook whereas OST files (Offline Storage Table) contains the replica of data stored in Exchange server. OST comes into existence when the cached mode is enabled from Outlook allowing user to work offline without Mail server. Any changes made will get itself synchronized when connected with the Exchange Server. The blog will be discussing the reasons why we need to convert OST files to Outlook PST file.

Need of Conversion from OST File to PST

The main reason why users prefer to convert their Exchange OST mailbox to PST file is the several issues of OST file that makes the OST file inaccessible or corrupted. Some of the causes that lead to the conversion of OST to PST file are as follows:
  • Issue of Exceeding OST Size Limit
    Size limit of OST file varies with different Outlook versions. In Outlook 2007, size limit supported was 20 GB, which was increased to 50 GB in 2010/2013 versions. Usually, the maximum default size limit is set to 20 GB, which is why performance of Outlook slows down when it reaches or exceeds this size limit.
  • Orphaned State of OST file
    Each OST file is bound to particular Exchange Mailbox and any modification made is continuously synchronized to Exchange Server. When the Exchange Mailbox is dismounted/deleted from the server, the OST file will become inaccessible leading to orphaned state.
  • Synchronization Problems
    It arises if there is any interruption while the OST file is being synchronized with the Exchange Server. Since the OST file is encrypted, decryption key of the Outlook profile needs to be matched with the one in Exchange Server. If it does not, OST file will face synchronization problem making file inaccessible.
  • OST Bound to MAPI Profile
    Since OST file is bound to a particular MAPI profile, its access can be only done when the user log in and authenticate using the profile that was originally used to create an OST file. In case of authentication failure, client will restrict user to open Exchange OST file and its contents.
  • Corrupted OST File
    OST file may be corrupted due to power failure during synchronization, virus attack, improper handling of OST file, damaged hard drive/local storage where the OST file was stored, etc. The OST file in corrupted state may lead to inaccessibility and loss of contents in it.

How to Convert OST to PST

As discussed above, the issues in OST file makes the conversion of OST to PST file necessary. However, Outlook does not support direct conversion of OST to PST file. To repair the damaged OST, an inbuilt utility scanost.exe can be used, which is now replaced by scanpst.exe for repair of both OST and PST files. This method is used only to repair slightly damaged OST file and does not convert OST to PST. Therefore, a reliable way for easy conversion of OST to PST file is possible with the help of a third party tool, OST to PST Converter. It has the ability to convert all the data items like emails, contacts, calendars, etc. in Offline OST file to Outlook PST file, keeping the original formatting intact after conversion. The tool also supports recovery of data from corrupted OST file and save OST mailboxes to Office 365 account.


The blog has been aimed to focus on various issues associated with Exchange Offline OST file and the need for conversion of OST files to Outlook PST files. It further defines a solution through which user can effortlessly convert OST files irrespective of their states to healthy PST file using OST to PST Converter software.

Monday, 22 December 2014

Convenient Technical Execution to Convert Exchange OST Email to PST File

Queries like how to convert Exchange OST email to PST file are very common amongst users because OST files often came across with sync issues with Exchange server. According to definition of OST file, it is Offline storage table is replica of Exchange data on hard drive of computer. MS Outlook when works with conjunction with Exchange server permits users to work in offline mode when connection with Exchange Server is not possible. As soon as internet connectivity is retrieved, OST file gets automatically sync with Exchange data, when sometimes fails to sync it displays error messages. Sometimes it becomes corrupt due to several reasons like virus attacks, bad sectors, email headers and accidental shut down etc. To restore OST file data it is important to convert OST in PST that requires some preparations. In this above listed section we will make you familiar with some pre-requisites necessary before OST data recovery along with tool to execute OST to PST.

How To Know OST File Corruption?

OST file data my get corrupt it displays typical type of error message on screen of user, one common error message amongst them is “Cannot open your default email folders. The file xxx.ost is not an offline folder”. This error message truly indicates that either OST file is corrupt or connection between Exchange and Outlook is not made. The method to resolve this issue is either to check of secure internet connectivity or to use third party Outlook OST Mailbox Recovery utility. Few important things taken in consideration are

  • Always backup your OST file data so that when data loss situations occur, the data can be restored from it.
  • Make sure you have sufficient internet connectivity between Outlook and Exchange server before your OST starts synchronizing with Exchange mailbox.
  • Always properly exit Outlook, so that all running programs can be closed before closing that program in between running positions.
  • Make sure you never attach virus infected USB or hard drives to your computer so that saved data on hard drive will not get infected.

How to Migrate OST to PST?

To safeguard your OST file data, it is important to follow above listed factors properly. If you have corrupt OST file with you, make use of Scanost.exe to fix the issue. But utility will help to resolve only minimal corruption issues of OST file. This manual procedure will only verify items from Exchange mailbox and help to restore missing items. If there are severe corruption in OST files them one must rely on third party tools to fix the issue. OST Recovery tool is most reliable application in terms of OST data recovery that helps to resolve even severe corruption issues in Outlook. Integrated with advanced set of features, the tool has scanning modes that will help to extract each item from OST mailbox without facing any data loss or concerning issues.

Tuesday, 2 December 2014

Go with Quiet Freeware Technique to Fix and View Exchange OST File

Microsoft Exchange OST files being a sensitive files show synchronization errors that makes users unable to access mailbox data. So in these types of situations it becomes necessary for them to hire online freeware utilities to fix and view OST file data. In this guide we will make you familiar with freeware online solution named as OST Viewer tool that are professionally equipped to solve OST file corruption.

Introduction to OST Files

OST file are is Offline file in MS Outlook allowing users to work in offline mode when internet connectivity with Exchange server is not possible. It is cache of data which is stored on Exchange Server’s. The benefits of creating this cache copy are to reduce the network traffic, provision to work in offline mode and reduce the burden on the Exchange server accounts.

OST File Comprises of Following Items:

  • Mailbox data i.e. Emails, Calendars, Contacts, Tasks, Notes and Journals
  • Hidden items and other overhead
  • Public folders
  • Shared folders

Causes of OST File Corruption

 OST files are very sensitive in nature and are being prone to corruption due to certain unforeseen reasons. These includes data storage device failures, power failures, networking issues, Virus or malware attacks, improper shut down of Outlook and other software issues. OST files when experience any of the issues they starts behaving abnormally. But the most common issues reported in OST files are synchronization issues. Users experience some issues and errors in OST file mostly when they synchronized OST files with Exchange Server. One common error message they receive is “Cannot open your default email folders. The file xxx.ost is not an offline folder file”.

The above discussed error appears in two situations;
  1. The OST file is damaged or corrupted and is in unrecognizable mode by MS Outlook. In such case when OST file is not recognized by Outlook it will report this error to users.
  2. OST file sometimes fails to synch with associated mailbox so in such cases also it will display this type of error messages.

How to Fix and View OST File Data?

Some users try to fix OST file issues using scanost.exe in built repair tool, but in some contexts it fails to repair OST file data. In such cases users feel secure in adopting freeware online solutions like OST Viewer because these tools has strong mechanisms to view complete OST file data to users after scanning all items. The tool to fix and view OST file is available free of cost to users so stop wasting time in thinking about worth of tool. Just download it and have desirable results without investing single penny.

In some cases users only have necessity of viewing an OST file items, in such cases we recommend you to use OST Viewer tool as tool will help to deeply scan and extract data even from corrupt OST file. The tool does not require MS Outlook and Exchange server to view OST file data which is most unique feature of tool. http://www.free.ostfile.co.uk/viewer/

OST Viewer Pro Version for Hidden Benefits

Upgrade to OST Viewer pro version that provides provision of exporting OST file data into Adobe PDF file format.  Using this OST Viewer pro tool user can view OST file in multiple views like HTML view, Email Header view, Hex view, Property view, MIME, Attachments and RTF view which is most helpful in digital investigation of OST files. Pro version of OST Viewer tool also provides advance search option for inspecting special emails from bulk OST files data.

Saturday, 15 November 2014

Techniques to Resolve Exchange Error 0x8004010f and Recover PST from OST File

Error 0x8004010f code is one of the most commonly faced errors when Outlook is used in conjunction with MS Exchange server environment. It is a MAPI error and occurs in several situations such as while downloading the Offline Address Book (OAB) files, while synchronizing OAB, while send/receive execution, corruption in OST file, etc. It is also a commonly encountered error when a new account is created on Exchange server. It has been found that if an organization running Exchange owns an offline list of address generator server, the particular error is usually received. This restricts any further synchronization, send/receive operation and it may also result in inaccessibility of OST file. In such situations, it gets necessary to develop any technique to resolve Exchange error 0x8004010f and recover PST emails from OST file.


  • When it is tried to synchronize the offline address list or OST file in Outlook with cache mode in enable state in Exchange, the below mentioned error message occurs in the folder or directory of Sync Issues. The lines of the error are as displayed below:
  • When it is endeavored to synchronize the .ost file or offline address book in Outlook with cache mode in disabled state in Exchange, the error message mentioned below is a common one.
Further, even after receiving error 0x8004010f if it is tried to transmit mails, the error: “Task ‘Microsoft Exchange Server’ reported error (0x8004010F): ‘The operation failed. An object could not be found’” occurs. With this, the synchronization between OST and Exchange server stops, restricting connection to Exchange mailbox and further conversion of OST file into PST format on the local/ client machine.


It generally takes about 24 - 48 hours for Exchange to generate the OAB for newly formed accounts. In the mean time, if any Outlook client tries to download the OAB then the error 0x8004010F pops up which indicates the failure of the download process. Therefore, new users should not attempt to download the Offline Address Book manually in Outlook. However, if the problem exists even after 48 hours manual download should be performed.


1. To fix the error users can view the Properties in Address list, check the settings of the Exchange server System Manager and verify the validity of address book. If the list is not valid then a new list should be added. The other way is to view Properties in Offline Address Book list and check the settings of Exchange System Manager. Thereafter, the validity of OAB in the Offline address list can be confirmed.
2. The error 0x8004010f can also occur while offline address list synchronization, if the client PC with Outlook has proxy settings and Internet Explorer browser is utilized. To eradicate the issue, Internet Protocol (IP) address of Exchange server 2007 Client Access Server should be listed in the exclusion list by utilizing the steps given below.
  • Open Internet Explorer (IE) web browser
  • Click the tab Tools, then click button ‘Internet Options’
  • In Internet Options window click Connections tab
  • In the LAN settings section, click LAN settings button
  • In Proxy Server section of LAN settings window, check ‘Bypass proxy server for local addresses’ box and then click Advanced
  • Then enter FQDN of Exchange 2007 CAS server and click OK
  • Thereafter restart Outlook program
Some more steps should be executed and are mentioned below:
  • On Exchange server, ensure if the offline address list generator server is running or not.
  • On the local PC, configure one proxy for and uncheck the box ‘Bypass proxy server for local addresses’.
  • Try to download OAB manually because the error occurs while downloading the OAB file also. Then check if the error has been fixed or not.
Most probably, the above mentioned techniques to resolve Exchange error 0x8004010f and recover PST emails from OST file are pertinent enough. But it may not be so and in that case an external recovery tool comes as a solution to the problem.

3. If none of the above recommended methods work out, then the cause of the error points to corruption in OST file. In such situations any professional application should be used to recover data items such as emails, calendars, contacts and others from the damaged and inaccessible .ost file. This is because the built-in OST Integration check tool (scanost.exe) that are present in other releases of Exchange has been removed in 2010 edition of Exchange server. Moreover, if executed in other releases it causes data loss. As a suitable alternative, a third party tool called Exchange OST to PST Recovery solution can be adopted without fear. This is because it recovers data corrupted .ost file and exports them in Outlook PST as well as other formats like EML and MSG. It proves as one of the most appropriate techniques to resolve Exchange error 0x8004010f and recover PST emails from OST file type.