File size limits of .pst and .ost files are larger - Outlook
Mar 31, 2022 · More information. The default .pst file size limit in Outlook 2007 and in Outlook 2003 is 20 GB. If you are using a computer that has Outlook 2007 or Outlook 2003 installed, and you want to access a Unicode .pst file that was created in Outlook 2010 or later, you may have to reduce the size of the .pst file if the file size is at or near 20 GB.
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