Outlook 2016 - chinese characters appearing in messages when replying/forwarding

Hello,

We have been able to reproduce the issue with a group of test users and a O365 group. It seems to be happening in the following fashion:

1. Plain text email is sent to O365 Group.
2. Group member is subscribing for emails sent to Groups.
3. Recipient of plain text email to Group replies to the email from user's personal inbox, i.e. replies to email that is sent as copy to group member's personal inbox based on "Subscribe" functionality.
4. Replies to Group emails from personal inbox creates Chinese character set, that replaces the previous sender's header details in the email chain.

The Chinese character issue does NOT repeat if a user replies to the email sent to the Group from the Groups view in Outlook, or from the O365 Group Conversation view in browser, or from OWA or from phone. Only when replies are sent from personal inboxes based on the O365 Group's "Subscribe" functionality.

BR,

Sam

Hi Sam,

Is there any update?

Best Regards,

Vanessa

Hi Sam,

Do these information mean that you have tried the suggestions above but got no difference?

In this situation, please share your domain with me via private message to analyze environment? Meanwhile, if convenient, you can share a screenshot with me via private message, which will help us further troubleshoot.

And then, open your Outlook client in safe mode to see whether the issue persists: hold Ctrl key and open Outlook. This is to rule out other add-ins interface.

Let me know how many users are affected by this issue or just one people. I have sent my test account to you via private message. Use it to log into your Outlook client to check again. This is to narrow down this issue is related to Outlook client itself or exchange settings.

Last, create a new user in pure cloud in Office 365 portal and test this account. I speculate this issue should be likely caused by server settings when these users are synced from on-premises. 

Thanks for your time.

Vanessa

Hello,

Here is more information for you:

1. The whole screenshots reproducing this issue.

I cannot share emails here due to security and here`s what is happening:

When replying to a message the From, Sent, To, CC and Subject fields in the message are replaced by text like this:

䐼噉氠湡㵧湥甭⁳汣獡㵳畏汴潯䵫獥慳敧效摡牥愠楬湧∽敬瑦•䥄㵒䰢剔㸢㰠但呎䘠捡㵥䌢•楓敺㈽ⴾ䈼㹒㰠㹂㱆䈯‾⁏㰠剂‾䈼匾⼼㹂洠䈼㹒㰠㹂㱔䈯‾㱏剂‾㰠㹂㱓䈯‾㱔剂‾†⼼但呎‾⼼䥄㹖䐼噉㰾䐯噉

This text appears between the previous messages body and the next messages email signature where those headers would be shown normally. 2. Outlook client version is 16.0.7668.2074. 3. Have you ever done anything when this issue happened?

Please elaborate what do you mean?

The issue started appearing after we started using O365 groups for messaging. Previously we used traditional distribution groups and this issue did not appear. 4. Are these senders and group who encounter this issue in pure cloud or sync from on-premises? In other words, when this issue occurs, are these mailboxes in pure cloud or on-premises?

Senders are in the cloud (synced from on-premises exchange). Groups are O365-groups, they are in the cloud.

Hi Sam,

Did you get a chance to check the information above?

Best Regards,

Vanessa