Same problem as well!!. mostly notice on IMAP accounts and replying to Gmail senders.
Only since updating to latest version of Outlook on Mac.
Outlook: 16.52 (21080801), using 'classic' version (IMAP!)
OS: Catalina 10.15.7
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Recently, original message header is lost when replying or forwarding emails in some Outlook mails.
It is strange that some emails retain the headers with time stamp etc. Some are gone.
Seeking help for this very important function...How to fix this?
Same problem as well!!. mostly notice on IMAP accounts and replying to Gmail senders.
Only since updating to latest version of Outlook on Mac.
Outlook: 16.52 (21080801), using 'classic' version (IMAP!)
OS: Catalina 10.15.7
See above by nzbloke...
"The problem is the incompatibility of the two options under Composing:
I just did this under both the HTML and Plain Text tab in Outlook and the headers appeared on email relies that I "know" didn't have them before. It wasn't gmail related for me -- unless the businesses whose email replies failed to include the header were actually gmail addresses. I had gmail addresses that worked just fine.
The failure to include was consistent with particular senders -- it never included them -- not just sometimes.
Will report again if this changes.
Problem finally appears to have been resolved in version 16.53 released today. Hurrah!