I have been getting 'your settings are out of date' sporadically with both Windows 10 mail and Outlook 365.
My settings aren't out of date as nothing changes and then the IMAP sync works correctly for several days, then occasionally I get a few of these out of date errors popping up. If I do nothing, it resolves itself about 5 to 10 minutes later.
Why is this happening?
I have checked all my settings are as stated in this article https://support.microsoft.com/en-us/office/your-account-settings-are-out-of-date-in-mail-or-calendar-for-windows-10-4484de9e-66b2-46a9-8459-6ca1fcc110b4#:~:text=To%20fix%20this%20error%2C%20use,sync%20settings%20%3E%20Advanced%20mailbox%20settings.
As it is not just me suffering this problem from a quick internet search, I can only assume it is something to do with Microsoft?
I spoke with my IMAP server provider and I don't get the issue if I log on to my mail accounts directly with a browser, so it is obviously an annoying glitch with Mail and Outlook 365.