Two sorts of files Microsoft Outlook uses to save data are PST and OST files. Personal Storage Folder is abbreviated PST; OST is Offline Storage Folder. An OST file allows users to create, view, and copy emails offline. It replicates the mailbox data of the Exchange platform server. There is storage for all mailbox data—emails, notes, attachments, calendar schedules, public folders, and so on.

The version of Outlook determines the fixed data size limit of OST files. Outlook 2002's maximum size for a data file is 2 GB; Outlook 2007's is 20 GB; Outlook 2010, 2013, 2016, and 2019, and Office 365's is 50 GB. Outlook may malfunction technically occasionally when the OST file is too big.

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What issues can a too-large OST file Cause?

• Microsoft Outlook crashes as you open it.
• Errors that surfaced while synchronizing
• Not able to include new data in the OST file
• OST and MS Exchange Server synchronizing might fail.

Methods for Managing Big OST File Repair

Using any of the recommended fixes discussed in this section will help you promptly fix the problem with large OST files.

1. Shank the size of the OST File using the Clean-up Option

Eliminating superfluous emails and other content will help to reduce the OST file size. Outlook offers a way to delete emails from the Deleted Items folder. The following steps should help you to make use of the cleaning alternative.

• Click Outlook's File Tab here.
• Choose Mailbox Cleaning from Tools.
• Choose Empty Deleted Folder Items to erase every file with one click.

1.Turn off the Add-Ins.

Sometimes Outlook's performance suffers in response to Outlook add-ins. Should such be the case, you can resolve the issue by turning off them. Act in the following ways.

• Click the Outlook File Tab.
• Choose from the Outlook menu the Add-ins option.
• Press the Go button after COM Add-Ins from the Add-in's Manage choice.
• After deselecting every add-in not presently in use, click OK.

2. Store Outlook's data archive.

Archiving the contents of the OST file will help you to create a backup hence shrinking the size of the file. One can maintain this archived data in another area of the system. The processes follow:

• Click Outlook's File Tab here.
• Click Clean-up Tools >> Archive.
• Set the Auto Archive option to archive the files.
• Using Outlook 2016, or 2019 on Windows, go to Files >> Info >> Tools >> Clear Out Old Items.

3. Make the Outlook Data File smaller.

Outlook's built-in Compact Now feature allows one to minimize the OST file size. Act in the following manner:

• Eliminate all the pointless information.
• Review the folder list, choose Deleted Items, then Empty Folder.
• First click the File tab then choose Account Settings.
• Click Settings then choose the data from the Data Files tab to be compressed or compacted.
• From the Advanced Tab of the dialogue box shown, choose Outlook Data File Settings.
• Click Compact Now after the Outlook Data File Settings dialogue box opens.

Using any of the above-stated techniques will help you to reduce cases of corruption and shrink the OST file size. Using an external OST to PST converter application will help you restore data from broken or useless OST files, though.

How could I convert OST to PST using third party Tool?

Many tools let you translate unreachable OST data into Outlook PST files. Under this category, one popular choice is DataVare OST to PST converter Expert. It can convert really elegantly. This tool converts everything in your mailbox—attachments, emails, calendars, contacts—into something else. This application lets one easily convert large OST files. Straight export of OST file data to an Office 365 live Exchange server is possible. Downloading the free edition of the application will allow you to check its running on your computer.

Generally speaking -

Huge OST files in your Microsoft Outlook might lead to certain issues. DIY solutions for the issue are offered on this page. An OST to PST converter tool will allow you to restore the data from an inaccessible OST file into a PST file. [ fixed] Manually fixing "oversized" OST File issues in Outlook