For detailed instructions on how to use and deploy Group Policies see this guide. If you are a corporate administrator and want to adjust the maximum allowed sizes of pst-files and ost-files, then you can use Group Policies as well. Note: Although the Registry path says “PST”, it also applies to ost-files. In this example the maximum size of pst-files and ost-files has been set to 100GB with a warning at 95GB. This difference has to be at least 5% since there is more written to a pst-file and ost-file than just user data. The second value is how many MB the system can write to a pst-file or ost-file. The first value is how many MB a user can write to a pst-file or ost-file before receiving a warning that the file is full. The following 2 new DWORD values must be created or set ĭon’t set this higher than 4090445042 (decimal) or f3cf3cf2 (hexadecimal)ĭon’t set this higher than 4294967295 (decimal) or ffffffff (hexadecimal) HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST Outlook 2016 / Outlook 2019 / Outlook 2021 / Microsoft 365.HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\PST HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\PST To increase the maximum size of pst-files and ost-files in Outlook, you’ll need to create and set 2 values in the following location in the Registry Note: This tip does not apply to pst-files and ost-files which are in the Outlook 97-2002 format (ANSI formatted pst-files). You can increase (but also decrease) this limit via the Registry or via Group Policies. In Outlook 2010, 2013, 2016, 2019, 2021 and Microsoft 365, this recommended limit has been set to 50GB. In Outlook 2003 and Outlook 2007, the maximum recommended size of a Unicode pst-file and ost-file has been limited to 20GB.
How do I increase the maximum file size of an UNICODE pst file? I heard that the default size for pst-files and ost-files is 50 GB but also that there must be a Registry value that allows to increase the maximum up to approximately 4PB (4096TB).
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