Recipient receives a winmail.dat attachment when sending email from Outlook with Outlook.com account

Last updated: June 29, 2017

ISSUE

When sending email to any contacts from your address book in Outlook, some recipients receive a winmail.dat file attachment that shows up in some clients such as Gmail and Yahoo web mail. In Outlook, the attachment icon is displayed but no attachment shown.

Outlook attachment icon

STATUS: FIXED

This issue is fixed in build 16.0.8229.2073. To install the fix, go to File > Office Account > Update Options > Update Now.

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See Also

Send an email message to a contact group

Fixes or workarounds for recent issues in Outlook for Windows

Resolve Outlook for Windows issues with automated troubleshooting tools

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