Moderator Committee Lead / Member Advocate Admin - Spirit of XDA
At The Good End Of My Hammer, Likes: My Family & XDA, Dislikes: Incompetence
The lock feature in WM6.5 has been an issue since the start. I have seen a few roms in BA and Fuze that work rather well with it (including with the exchange server), but I have seen a crap-load of reports from people with similar issues to yours. I don't know how far advanced the 6.5 development is for the Herman, but if I were you I would probably stick to Mighty 4 Reborn, Fallen 2.1, or some other 6.1 rom. Stay away from 6.5 if you must use the rom for heavy, work-related, daily use.
Also, take out the SD card before SR if you see that the phone is telling you that it will format your storage. Good luck!