I'm seeing that I can get GW address book sync going with an account on
Mobility as long as I don't change the sync'ed book once the new user is

For example, I set myself up in Mobility with my EVO and set a book in GW
called "Mobile Contacts", changes from GW are sent to the device and from
the device to GW. Now I decide I want to change to a different GW address
book called "New Mobile Contacts" which I log into the web interface of
Moblity and a change and save it but nothing happens on the device or GW

The only way I get the contact changes to work is to delete the Activsync
account from the device then delete my Mobility account then wait and then
recreate everything. I have re-created this on two iPhones and my EVO 2.1