- Close Outlook.
- Open the Registry Editor and navigate to this location. If the path does not exist, create the appropriate keys.
Outlook 2010
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
Outlook 2013
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences
- Create a new DWORD: MaximumAttachmentSize
- Enter the size in KB. 0 is unlimited.
- Close the Registry Editor and launch Outlook.
- All done!
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