How to Fix ‘Oversized OST File’ Issues in Outlook

PST or Personal Storage Table is a file format used by Microsoft Outlook to store emails, calendar, contacts, tasks and other items. An Offline Storage Table (OST) on the other hand is an offline folder file that makes it possible for the user to work offline and later synchronize changes with Exchange next time they connect online.

Both PST and OST files can get corrupted if they exceed certain size limits. Now, what are these limits?

Outlook Version OST File Size Limit
Outlook 2002 and earlier editions 2 GB
Outlook 2007 20 GB
Outlook 2010 and later editions 50 GB

Your OST file contains all data ever since your Outlook profile was created. This includes all your emails, attachments, contacts, notes, folders and so on. When you don’t clear unnecessary data on a regular basis, all of this data gets added up, resulting in a large OST file.

Problems faced due to large OST file

  • It will take longer to open your emails and attachments.
  • Cannot add data to an existing Exchange .ost file.
  • Cannot fix synchronization issues between OST file and MS Exchange server.
  • You keep getting ‘Outlook is not responding’ message.

A large OST file can cause corruption and you might end up end up losing entire data.

To avoid corruption:

  • Delete unnecessary emails.
  • Archive your emails based on certain criteria.
  • Create a backup of your PST file and remove unnecessary items.

Let us look at a couple of manual solutions to get rid of oversized OST problem.

  1. Disable all Add-ins

Disabling unnecessary Add-ins is a great way to speed up your Outlook, run more reliably and take less memory.

  • Open Outlook application.
  • Go to File -> Options -> Add-ins.
  • Under Manage option, select COM Add-ins and hit
  • You will see a list of Add-ins. Select all the Add-ins that are not needed/non-functional and click OK.
  1. Archive OST File data
  • Open Outlook application.
  • Go to File -> Cleanup Tools -> Mailbox Cleanup.
  • You find 3 options here:
  • Find items older than the specified number of days; Find items larger than specified kilobytes.

You can adjust any of these values and hit the Find button. You will either see old files or large files depending on the size limit specified by you.

Delete all the unnecessary files.

  • Older items can be moved to an Archive folder by clicking on AutoArchive
  • You can click on Empty to delete the deleted items folder permanently.
  1. Reduce OST File size
  • Open Outlook application.
  • Click on File -> Account Settings -> Account Settings
  • In the Account Settings window, click on Data Files
  • Now select the large-sized OST file and click on Settings.
  • Now click Compact Now.

If you are looking to convert your OST file to PST, you can do so using a reliable tool called Remo OST to PST Converter.

It is one of the best ost to pst conversion software. The software is compatible with all versions of Outlook.

If you are looking for Microsoft ost to pst converter free software, Remo OST to PST Converter is your solution. You can get a healthy PST file as the output even if your OST file has an encrypted password.

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