This occurs both in Oulook for Mac and Mail, so I suspect it is a Google thing!
I have about 400 emails, in all my folders on Google.
When I sync this is fine and the emails in my inbox are correctly downloaded and match
However I have an "all mail" ox that has 29,000 emails in it.
I have deleted the folder and it returns, I have deleted individual emails and they all return
I have checked Googlemail again and there is no folder with these emails.
Where do they come from and how do I get rid of them?