Exchange Migration

Hi,

I have an exchange 2003 (sp2) organization.

I want to migrate to exchange 2010.

My users are using actually: outlook clients (2003, 2007, 2010).

I want to verrify two things before dowing the migration:

• Do users having their mailbox being moved remain offline until the operation completes?
• After installing the new exchange server, do the outlook profiles need to be recreated using autodiscovery?
• Do the outlook clients uses the legacy url?

Thank you.