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In Outlook 2013, go to File > Cleanup Tools > Archive.This can help reduce OST size significantly while keeping all emails intact. Instead of deleting older emails, you can move them to a local PST or personal folder file. Method 4: Move Mail Items from OST to PST or Archive Folder To set the new or reconfigure the OST file size limit, you can refer to this guide on Microsoft Support page. The following are the default and valid range of ANSI and Unicode formatted OST that you can change. Refers to the ANSI formatted OST file size limit to a maximum of 2 GB (Outlook 2000) This lets you set the Unicode formatted OST file size limit to a maximum of 50 GB for Outlook 2010 and later or 20 GB for Outlook 20 There are four registry entries that you can edit and set the maximum size to which OST can grow, If you don’t want to delete older emails or remove attachments from emails, there’s an alternative way, where you can use the registry to reconfigure the OST file size limits by changing the registry key’s entries and values. Method 3: Use Registry Key to Configure OST File Size Limit You can also Find items larger than, Empty Deleted Items folder, View Deleted Items Size, View Conflicts Size, or Empty Conflicts to reduce the OST file sizeįurther, you can look for large emails, download all the attachments, and then remove the attachments from emails to reduce the OST file size.Enter the number of days to find the older emails and delete them to reduce the size of the OST file and mailbox on the server.