How to increase the Outlook attachment size limit

  1. Press Windows-R
  2. Type “regedit” in the Run dialog
  3. Click OK
  4. Find proper key for you outlook version
  5. If you see MaximumAttachmentSize double-click it, if not create it as DWORD
  6. Enter the desired attachment size limit in KB under Value Data: (for 25 MB limit use “25600”)
  7. The default value (with MaximumAttachmentSize not present) is 20 MB or “20480”.
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