Lion Server: Is Mobility in Workgroup Manager related to Profile Manager in the Server.app?
Mobility in Workgroup Manager and Mobility in Profile Manager are tools to do the same job. If you have used previous versions of Mac OSX Server Workgroup Manager is familiar but is now deprecated. Profile Manager should do all that is required to set up a network account that is accessible on a laptop out of the network office. 
What I have found is that using both tools at once on a single device/account is, as you might expect, not helpful in identifying and setting good syncing rules.
My experience is limited to small networks (&lt;10 devices) and this information comes as a result of my test server experience, as I have yet to upgrade any production servers.