After rebooting Unity 4.2.1 to get it to recognize the PST time change, now we can't add any new subscribers. If you try and add someone, there is a long delay and then a "fatal error" message.
The user ID and exchange 2003 mailbox are created.
If you attempt to import the user, Unity throws up another error message:
The list of available servers is empty.
Until this is rectified, it will not be possible to import subscribers.