So I'm able to reproduce a strange issue where if I open up emails that were sent to me, they open in an editor as if I had composed them myself. The reply/forward buttons are missing (since Outlook is treating it as an email I'm writing). The original emails are in the To: and From: fields. So far I can only reproduce it when the ACT addin is enabled. I'm using Office 365. It's only happening for one of our users, but it follows that Outlook profile around no matter which computer they're using it on.
Tuesday - last edited Friday
Unfortunately this is a known bug awaiting a fix. v21.1. Update 1 was OK, it was introduced with update 2 for 21.1.
Do you happen to have a link to another forum post or "known issue" post for this issue? I looked through the forums and didn't see any other mention of this issue after a cursory look.
Friday - last edited Friday
Has been reported by me to SPI in July 2019; is listed as GS-1613 (that 's their internal bug number...) and is open. A fix was promised for v22.0, but not done. You won't find references in the "open" part of the community, AFAIK all related posts are in the "ACC-restricted" part.