How to increase Unicode PST files size

Ans: You need to go to the following location in the registry:

  1. Outlook 2003: HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\PST
  2. Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST
  3. Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST
Then create 2 new DWORD values (these values are case sensitive):
  • Warn Large File Size: The value is how many MB a user can write to a pst-file. This value cannot be higher than higher than 4090445042 (decimal) or f3cf3cf2 (hexadecimal).
  • Max Large File Size: This value is how many MB the system can write to a pst-file. This difference has to be at least 5% since there is more written to a pst-file than just user data. This value cannot be higher than 4294967295 (decimal) or ffffffff (hexadecimal).

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