![]() Opening a command prompt by pressing the Win R cmd and run the following two lines. The following 2 new DWORD values must be created or set, to increase the Outlook Data File limit.ĭo not set this higher than 4090445042 (decimal) or f3cf3cf2 (hexadecimal)ĭo not set this higher than 4294967295 (decimal) or ffffffff (hexadecimal) HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST Increase Size of Outlook PST Data File and OST Data File Outlook 2016 / Outlook 2019 / 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, the values must be created and set under the following key in the registry. ![]() How to increase the maximum file size of a PST Data File ? ![]() Outlook 2010, 2013, 2016, 2019, and Microsoft 365 set this recommended limit to 50 GB. In Outlook 2003 and Outlook 2007, the maximum recommended size of a PST Data File and an OST Data File was limited to 20 GB. The size is determined by the registry value in the registry, the maximum can be increased to about 4 PB (4096 TB). ![]() Outlook limits the default size for PST Files and OST Files to 50 GB.
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