Also is there any way of being notified by email when someone replies in this thread?

With my Hotmail IMAP account, deleted messages are moved to the 'Deleted on Hotmail' folder in the Server Settings section of Account Settings. The icon is like a recycle bin. There is no other Deleted folder in the folder pane, and no other such folder visible when the account is selected in the Folder Pane, then right-click, Subscribe. So, I can't explain how you got a Deleted folder with a yellow icon, unless you created it on the Hotmail website, and subscribed to it in TB.

If you set up notifications in your forum account, replies to this thread should be sent to your forum email address.

Hi sfhowes

You inadvertently gave me the solution. I went to the Server Settings section of Account Settings, and where it says "When I delete a message move it to this folder" I changed it from one Deleted folder (which Thunderbird had created when I set up the account, goodness knows why) to the other one (which is the one that hotmail webmail uses as its Deleted folder, and which is therefore a system folder that it won't allow to be deleted).

Once I'd done that the system folder took on the recycled bin icon, and the one that TB had created took on a yellow icon. I was then able to delete the one that TB had created.

Weird that TB created that redundant Deleted folder in the first place, but thanks for pointing me towards the solution.

Dave

PS - I did get an email notification of your post. It wasn't obvious that I was going to get one though. It would be nice if this webpage said something like "you will receive email notifications if anyone replies to this thread."