Switching main domain

[Netmaking]

I have a client who has domain1.com as the main domain for their account, and
domain2.com as a parked domain. The problem is that it should be the other way
around. This hasn't been a problem before now, when they've decided to
discontinue the use of the domain1.com domain.

So, I was wondering if there's an easy way to switch a main domain with a
parked domain.

[alexheizer]

Has anyone discovered a way to do this yet? I also need to switch a parked domain to be the main domain and don't want to lose the client's 300MB of IMAPped email and email accounts/passwords by deleting the parked and main domains and re-inputting the parked domain name as the main domain name.