Outlook.com upload limits
Current source-checked limits for Outlook.com. These rows are staged because the official sources did not state policy effective dates.
Short answer
25 MB total email size limit in Outlook.com
The 25MB limit includes message text, inserted content, and all attachments. Leave headroom below the total. Outlook limits can vary by product and administrator policy. Verify the exact account or tenant before relying on this row.
Rows
Consumer account
Outlook.com attachment
25 MB total email size limit in Outlook.com
- Source checked
- 2026-09-28
- Effective date
- Not stated by source
- Duration / resolution
- Not stated in this row
- Confidence
- official-with-caveat; verified:false
Internet email accounts in Outlook
Total email size in Outlook desktop
20 MB total email size for Outlook internet accounts
- Source checked
- 2026-09-28
- Effective date
- Not stated by source
- Duration / resolution
- Not stated in this row
- Confidence
- official-with-caveat; verified:false
Nearby platforms
This staged dataset began on 2026-06-29. See each row for its source-check date and unresolved evidence. Rows remain unverified where an exact policy effective date is not established; always re-check the official source and in-product upload prompt before publishing or sending media.