Knowledge Base

CodeTwo Public Folders PST size limitation in different version of MS Outlook

This article is meant for users of CodeTwo Public Folders. This software has been discontinued. You can check the list of currently available CodeTwo products here.


There is a warning displayed which says that the maximum size of the PST file has been reached.


A local copy of public folders is stored in a PST file in each computer with an Outlook Add-in installed. By having local access to the public folders PST file, a user is able to work with public folders in offline mode when CodeTwo Public Folders Syncing Master is unavailable. Each user of a computer has their own separate PST file in which data from public folders visible to them is stored. By default there is set a lmitation which is different for various versions of the Microsoft Outlook software:

  • For the versions prior to 2003, the maximum size is 2GB.
  • For Outlook 2003 and 2007 it is 20 GB.
  • For Outlook 2010 / 2013 / 2016 the maximum size is 50GB.

If the size of the file reaches the limit, a warning will be displayed. In order to reduce the size of local PST file, you can compact the file, remove some unnecessary data from public folders or remove a a user's right to see certain folders.

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