Hello Rich9999(2),
I apologise for the confusion earlier. I understand that you’ve already checked the standard solutions. This issue of read status not syncing back to Outlook Gmail is peculiar.
Given that you’ve already verified IMAP settings, ensured Windows updates, confirmed two-step verification, and checked folder settings, this might be a more specific issue with the sync between Outlook and Gmail.
You could try to check the sync settings specifically for your Gmail account in Outlook. Here’s how:
Open Outlook and select File.
Go to Account Settings > Account Settings.
On the Email tab, double-click on your Gmail account.
In the Change Account window, click on More Settings.
Go to the Advanced tab, and under ‘Folders’, ensure that the option ‘Mark items for deletion but do not move them automatically’ is selected.
This setting sometimes affects how Outlook syncs read/unread status with Gmail.
I hope this helps, and I’m sorry for any inconvenience this has caused you. Let me know if you have any other questions or need further assistance.
Kind regards,
Segunfunmi.