Dear @Larry Graves,
Thank you very much for sharing this workaround with the community. That’s a great observation, and your explanation clearly highlights the distinction between an appointment and a meeting in classic Outlook. You’re absolutely right, once attendees are added and the item becomes a meeting, Outlook restricts copying or moving it between calendars.
Your approach of creating the appointment first, copying it to the other calendar, and then adding attendees is a practical and effective workaround. While it’s admittedly a bit inconvenient, it can definitely save time and prevent re‑entering all the details.
If you haven’t already, I’d strongly encourage you to submit this feedback directly to Microsoft through the Outlook in‑app feedback option or the Microsoft Feedback Portal. Suggestions like this, especially when they include clear repro steps and real‑world impact are exactly the kind of input the product team reviews for potential future improvements.
Thanks again for taking the time to post and help other users tips like yours make these forums much more helpful.