I subscribed to my threads via the RSS feed link that's posted beside the topic heading. I added my feeds to Outlook, but when someone posts in my thread Outlook doesn't see anything, not even my initial post. Other RSS feeds do seem to work, so I think this is a bug the developers need to be aware of. Not sure where to report it though.
(Note: I originally tried to post this under the errors forum, but it doesn't seem to have worked!)