Currently we have:
MyDomain.com with a live website.
We also have:
MyDomain.net which we're currently developing using the WPMU installation.
The plan is:
Make MyDomain.net live, and point myDomain.com away from the current server space, and to the MyDomain.net server space.
To emulate, as far as possible, the current structure, and apply 303 in due course.
We have a dedicated server with multiple several domain, each using the same DNS template in Plesk, with A Record IP added to all domains, including MyDomain.net via 1AND1.
I understand that updating a Domain Name is WPMU might not be as simple as we expect - I refer to this: http://codex.wordpress.org/Moving_WordPress ---
Any tips or advice on this would be much appreciated.