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Unable to Compress PST File Larger Than 50GB: What to Do?
by Pideyos pideyos - Wednesday, 5 November 2025, 10:24 PM
 

I am facing an issue with my Outlook PST file, which has grown larger than 50GB. When I try to compress or compact it, Outlook either freezes or shows an error saying the operation can not be completed. I have already deleted unnecessary emails and emptied the "Deleted Items” folder, but the file size still won't reduce much. Is there any reliable way to successfully compress or reduce the size of a large PST file (over 50GB)? Also, are there any recommended tools or manual methods to fix this problem without losing data?

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Re: Unable to Compress PST File Larger Than 50GB: What to Do?
by Natha Ncook - Wednesday, 5 November 2025, 11:01 PM
 

If your Outlook PST file exceeds 50GB, it can cause Outlook to slow down or freeze. In this situation, you need to compress the PST file to reduce its size and make Outlook run smoothly. With Softaken Compress PST Software, you can shrink a large PST file in minutes. This tool compresses the PST file without any data loss and improves Outlook performance. You can also reduce the size by removing or compressing only email attachments.

Key Features:

  • Securely compress large PST files
  • Works with all Outlook versions (2021, 2019, 2016, etc.)
  • No data loss
  • Easy and fast process

To speed up Outlook and save space, definitely try Compress PST Software.