Using older versions of Outlook for Mac for personal email and calendar
Shortly after I posted this, my Macbook had to go in for repair for an unrelated issue so was out of action for around a month or so.
During that time I was woking on an old 2014 Macbook Pro running 11.2.1 Big Sur. When I upgraded that to the new Outlook I had the same issues.
On both machines, switching back to the old outlook version seemed to resolve the matter,
There is definitely a major flaw in the new version of Outlook for Mac (when working with a Gmail account at least) which Microsoft have failed to sort...
On both machines it asked for feedback on why I was switching back so have explained exactly why, not that I expect anyone will actually feed back to the technical department responsible for the software development...
Pretty poor from Microsoft to a) let it roll out without picking up and resolving such a fundamental issue, and b) not sorting out a fix in 2+months since I first posted about this. Going to start a new thread and link it to this one since I'm not convinced anyone who monitors these forums will pay much attention to an old thread.