Using older versions of Outlook for Mac for personal email and calendar
There are three other possible workarounds for this issue:
Upgrade to 16.110.1 Current Channel (Preview) - See the Answer by "Jayden-P Jun 23, 2026" in
https://learn.microsoft.com/en-us/answers/questions/5923453/outlook-for-mac-bug-original-message-not-included?orderby=newest
Rollback to 16.109 - See the Answer by "Dora-T May 19, 2026" in
https://learn.microsoft.com/en-us/answers/questions/5896100/outlook-for-mac-reply-forwards-does-not-include-th
Switch to Plain Text - See the Answer by "Franz Jun 17, 2026" in
https://learn.microsoft.com/en-us/answers/questions/5915486/my-original-email-is-not-showing-up-in-replies-i-a
Most active Q&A thread on this issue:
https://learn.microsoft.com/en-us/answers/questions/5923453/outlook-for-mac-bug-original-message-not-included