Last Updated: October 19, 2020


When you receive an email in Outlook that has attachments that contain double-byte character set (DBCS) characters, the attachment’s filename may become corrupted.  This issue may be seen when emails with attachments are sent from POP accounts in Thunderbird and other applications.


This issue is fixed in Build 13416.10000.  The fixed build will be in Office Beta Channel ~10/23/20.  The fixed version is anticipated in Current Channel in late November 2020.  

More Resources

Icon Experts (brain, gears)

Ask the experts

Connect with experts, discuss the latest Outlook news and best practices, and read our blog.

Outlook Tech Community

Icon Community

Get help in the community

Ask a question and find solutions from Support Agents, MVPs, Engineers, and Outlook users.

Outlook Forum on Answers

Icon feature request (light bulb, idea)

Suggest a new feature

We love reading your suggestions and feedback! Share your thoughts. We're listening.

Find out how

See Also

Fixes or workarounds for recent issues in Outlook for PC

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!