Using Classic Outlook on Windows for personal email, calendar, and contact management
I found another interesting article on this topic or related topic at Gmail IMAP - Solving the [Gmail] separation - HowTo-Outlook (howto-outlook.com)
I'm wondering if the issue is caused by the two sets of folder/label structures? Has anyone tried aligning with [GMAIL] as the root folder and did that solve the problem? (Unfortunately, it takes additional work to be able to see the gmail folders if one does this - this might also help those who have switched to [INBOX] and back and "lost" folders in the process.
If this is part of the issue, I can better understand part of the issue of correcting it - it could take a great deal of work, and then a minor change in GMAIL could cause that work to need to be redone.