Hi @reng 

Thank you for bringing this to our attention. These kinds of things will have different potential causes. In some cases we can associate them with data retention policies, but not always. 

When this occurs, we typically suggest moving the account to our latest sync experience.

The transition will create a more reliable sync experience between Front and Exchange/Office365, as we will stop syncing actions taken in Front like reading, archiving, or tagging. The following actions will continue syncing between Exchange/Office365 and Front:

• Emails sent 
• Emails received
• Emails marked as spam
• Emails unmarked as spam 

It’s important you know that all of your email conversations will continue to be accessible across both systems.

Please reach out if you’re interested in moving forward with this change. We’d be happy to assist!

Hello,

This just happened to us again. Over a thousand emails reopened by Office 365.

We thought the issue was resolved when this happened before and we “re-synced” our email accounts, but something is still triggering these old emails to reopen. 
 

If it was one or two, no big deal. But it’s thousands in our case. 

EDIT:  This turned out to be a third party application used to backup Office 365 mail.

This happened to us over the weekend as well.  Tens of thousands of messages in our case.  Front support solution was to manually archive them again and move to the new sync method (which doesn’t sync read/unread, so is not valuable and is not an enhancement). 

I’m assuming this was an undisclosed systemic issue on Front’s end rather than us making a change on 365 as Front support suggests.  We do not access these mailboxes except through Front sync.

Hopefully I’ll get a reasonable answer to what is going on.