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Outlook Attachment Size Limit (2026): Every Account Explained

Outlook attachment size limit for 2026: 25 MB on Outlook.com, 20 MB in classic Outlook, 35 MB on Microsoft 365. Why emails fail and how to send bigger files.

outlook email attachments file size limits+2

InvisHosting Team Nov 5, 2026

11 min read

InvisHosting Blog

Outlook Attachment Size Limit (2026): Every Account Explained

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Outlook Attachment Size Limit (2026): Every Account Explained

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