I have problems with my folder structure after renaming mail folders. I'm using TB115.15.0 on Ubuntu 22.04, my uni is using outlook as a mail service config'ed with OAuth2. In settings->server->advanced, I have ticked the "show only subscribed" and "server supports folders" options. A week ago, I have renamed folders, e.g. 3-class-2023-24-this to 4-class-2023-24-last using TB. The structure/renaming shows up correctly when viewing with the outlook web client. But the old folder 3-class with its content still shows up in grey/italics. In the 'subscibe' menu, I can unsubscribe and submit. But no change in the folder presentation, and when I re-open subscribe, I'm shown this old folder still with a tick as being subscribed to. Similarly for the renamed: It is show as subscribed to at top level, but none of its subfolders. Subscribing to them makes no change, i.e. no subfolders added in the folder structure, and a subsequent subscribe view shows no change in their subscription status, still opens without a tick. I've seen a lot of posts about ghost folders, with the issue being server side. However asking MS to fix their outlook server protocols for TB seems futile. And our IT service does not officially support TB. This is an annual change-over, and I even tried the brute force delete/add the mail account, but TB has remembered the username ans still gives me the same defective structure in the subscribe window, but now only shows the Inbox. I see no means of making the other folders visible. Any solutions? Thanks, Jens