

Close Registry Editor and restart Outlook for your changes to take effect.The recommended size is at 95% of the MaxLargeFileSize value. Use the same method to create another DWORD entry named WarnLargeFileSize.For example, if you want to raise the size limit of PST file to 100 GB, just enter 102400 and click OK. In the “Edit DWORD Value” pop-up, select Decimal and then specify the PST size limit in MB.Name the new DWORD entry as MaxLargeFileSize, and then double-click it to modify.Next, right-click the blank space in the right pane and choose New > DWORD (32-bit) Value.Note: Replace xxx with your Outlook version number. HKEY_CURRENT_USER\Software\Microsoft\Office\xxx\Outlook\PST If the PST key doesn’t exist, you have to create it manually.


“The Outlook data file has reached its maximum size. Whenever a PST file reaches its maximum size limit, Outlook will slow down or you’ll get the following error message: As time goes by and your PST file grows larger and larger. All versions of Microsoft Outlook use a single PST file to store emails, contacts, calendar and other data.
