one other question... if the address book is updated do you need everyone to reflect those changes automatically?? because that is more difficult.
If you need a centralized address book just export the master address book and save it as a CSV (comma separated value) and just save to a share and have everyone else import it ...thats the easy way
As far as I know, the outlook address book is combined in the pst file, so it cant be opened by more than one person at the same time (we tried this at work for the address book).
With Outlook Express, it uses the "Address Book" which comes with Windows, and therefore uses the "*.wab" file which to the best of my knowledge CAN be opened by more than one person. Might be worth putting some contacts into the Window's Address Book (Start, All Programs, Accessories, Address Book) and then export the file out to a server location. I think you could change something in the registry to tell Windows that the *.wab file is at a different location than the normal one.
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS