Roving users in Exchange Server 5.5

Not quite sure what you mean by "roving users."

If you mean users that can connect from any computer and access saved email, there is no difference on how you set up the mailbox/user account in Exchange.

The difference is how the profile is created in Outlook. In order to access email from anywhere, the user's email must be delivered and saved in the Exchange mailbox, and not in a .pst file saved on a local computer.

Email profiles must still be created on each computer from which a user wants to access email.

If this is not what you mean by "roving users," please explain further.