Hi Carter, Brad
Thank you for posting your question in the Microsoft Q&A forum.
According to the workflow you described, I also attempted to replicate the steps using my environment (macOS Sequoia 15.7.1 and Outlook version 16.103.1 25111624) and I found that I am not experiencing the same issue.
Based on my research and experience, I would like to share some information from my side, which I hope will prove useful. (Please let me know if I’m mistaken)
Immediate Workarounds Using CMD + Tab: These will not completely resolve the issue, but they can make your workflow less cumbersome compared to using the mouse.
- Open the message you want to respond to > Send the email (the window closes).
- Press CMD + Tab once to immediately switch back to Outlook.
- Press CMD + SHIFT + M to archive the message.
If the previous version did not exhibit this issue, you might consider temporarily switching back until the next update is released:
Update history for Office for Mac - Office release notes | Microsoft Learn
Additionally, I found this discussion seems to describe similar behavior on Mac:
force mac to always focus on last-used wi… - Apple Community
(Note: Microsoft is providing this information as a convenience to you. These sites are not controlled by Microsoft, and Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please ensure that you fully understand the risks before using any suggestions from the above link)
You may also consider sharing your feedback directly with Microsoft via the Help > Feedback option in Outlook, or by going to Ideas · Community
I hope my answer can partially provide some helpful ideas. Please don’t hesitate to reply in the comments section if you have any further questions
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