Microsoft has released a fix for a December update that prevented Microsoft 365 customers from opening emails encrypted with “Encrypt Only” in classic Outlook, which caused affected users to see a message_v2.rpmsg attachment instead of readable content. The patch is available to Beta Channel customers now and will roll out to Current Channel and Current Channel Preview in February, with temporary workarounds including using the Encrypt option under the Options ribbon or reverting to a non-affected build via the officec2rclient.exe update command. #Microsoft #ClassicOutlook
Keypoints
- A December update stopped Microsoft 365 users from opening “Encrypt Only” emails in classic Outlook.
- Impacted messages appear as a message_v2.rpmsg attachment, making encrypted content inaccessible.
- Microsoft identified the issue in Current Channel Version 2511 (Build 19426.20218).
- A fix is in the Beta Channel now and will roll out to Current Channel and Current Channel Preview (Build 19725.20000) in February.
- Workarounds include using the Encrypt option under the Options ribbon or reverting to build 16.0.19426.20186 with the officec2rclient.exe update command.