Email recipients receive Winmail.dat file attachments from Microsoft Entourage for Mac users in Microsoft Office 365 pre-upgrade. The following are two scenarios in which users experience these symptoms:
- An Office 365 pre-upgrade user creates and sends an email message by using Entourage. When the recipient receives the email message, the message contains a Winmail.dat file attachment.
- An Office 365 pre-upgrade user receives an email message from a sender who uses Entourage. When the Office 365 pre-upgrade user receives the email message, the message contains a Winmail.dat file attachment.
This issue occurs if an Entourage user sends a message by using an encoding format that isn't supported by Microsoft Exchange Online.
To fix this issue, the sender must set the encoding format for messages in Entourage.
To set the encoding format in the settings for Entourage, follow these steps:
- In Entourage, click Preferences.
- Locate Mail & News Preferences, and then click Compose.
- Under Attachments, set the Encode for option to Windows (MIME/Base64).
- Click to select the Append file name extensions check box.
- Exit Entourage, and then restart it.
To set the encoding format for a single message, follow these steps:
- In Entourage, on the File menu, click New, and then click Mail Message.
- Type the email address of the recipient in the message, and then close the address window.
- Under Attachments, click Encode for any computer.
Note By default, the AppleDouble option is selected.
- Under Encode for, click Choose Windows (MIME/Base64).
- Click OK, and then send the message.
Still need help? Go to the Office 365 Community
Article ID: 2022993 - Last Review: February 27, 2013 - Revision: 11.0
- Microsoft Office 365 for enterprises (pre-upgrade)
- Microsoft Office 365 for small businesses (pre-upgrade)
- Microsoft Office 365 for education (pre-upgrade)
- Microsoft Exchange Online
|o365 o365a o365e o365p o365062011 pre-upgrade KB2022993|