ian davidson

Aelita is now owned by Quest Software http://wm.quest.com and the EMW tool
(Exchange Migration Wizard) will fit your requirements.

As far as advantages go - how about the following :

Up front dir synch
Up front mail synch

users mailboxes switched to new server AUTOMATICALLY.

OST files preserved for laptop users

Users pretty much unaware of a migration taking place.

You definetly need to look at it.

http://wm.quest.com/products/exchangemigrationwizard/

Ian D