Excel attachments are going to mobile devices as winmail.dat

Travis Kaltenheuser 0 Reputation points

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A family of Microsoft email and calendar products.
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A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
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Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 41,016 Reputation points

    Hi @Travis Kaltenheuser ,

    Does this issue only affect this particular message?

    Based on my experience, this issue is usually related to the mail client of the sender side. From the screenshot you shared, seems like the problematic message was sent from a mobile device, right? If this is the case, to help narrow down the problem, I'd recommend asking the sender to resend the mail again from another mail application like Outlook for Android or using Outlook desktop for Windows or Mac and see if the issue persists.

    By the way, considering that it's a public community, I've edited the image you shared by obfuscating email addresses for privacy concerns.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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