How To Change Outlook 2010/2013 Attachment Size Limit

  1. Close Outlook.
  2. 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
  3. Create a new DWORD: MaximumAttachmentSize
  4. Enter the size in KB. 0 is unlimited.
  5. Close the Registry Editor and launch Outlook.
  6. All done!

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