Microsoft 365

Send a large file (too big to email)

Most email systems won't accept attachments much bigger than about 20 MB, and big attachments fill mailboxes. Send a link instead.

Share from OneDrive or SharePoint (recommended)

1. Save the file in OneDrive (or your team's SharePoint/Teams files).
2. Right-click the file > Share (or select Share at the top).
3. Choose who can open it. Specific people is safest for anything private, and choose Can view unless they need to edit.
4. Enter their email address and select Send, or Copy link and paste it into your email.

In Outlook

When you attach a file that's in OneDrive, Outlook offers to share it as a link. Choose that for large files.

Receiving a big file?

Ask the sender for a link. Be careful with unexpected links, though: if you weren't expecting a file, check with the sender by phone first. See Is this email a scam?

More on OneDrive: OneDrive basics.