Manage Outlook Data File Size in Windows
The default data file size in Outlook for Windows depends on the version of Outlook you're using:
- Outlook 2010 and Later (Unicode format): The default maximum size is 50 GB
- Outlook 2007 and 2003 (Unicode format - if applicable): The default maximum size is 20 GB
Steps to Increase Outlook Data File Size:
1) Open the Registry Editor:
· Press Windows + R, type regedit, and press Enter.
2) Navigate to the Registry Path:
·
For Outlook 2016, 2019, and Office 365:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST
·
For Outlook 2013:
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\PST
·
For Outlook 2010:
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST
3) Create or Modify the Registry Values:
·
MaxLargeFileSize: Defines the maximum
size limit of the PST/OST file.
·
WarnLargeFileSize: Defines the warning
size limit of the PST/OST file.
How
to Add These Values:
·
Right-click in the right pane, select New >
DWORD (32-bit) Value.
·
Name the new value MaxLargeFileSize and
WarnLargeFileSize respectively.
·
Double-click each value to set the data (in MB):
In the "Edit DWORD Value" window, choose "Decimal" under "Base".
·
MaxLargeFileSize: Set it to a value like 102400
for 100 GB.
· WarnLargeFileSize: Set it slightly lower than MaxLargeFileSize, for example, 95000 for 95 GB.
4) Restart Outlook:
·
Close the Registry Editor and restart Outlook to
apply the changes.
