Migrate OWA servers (2007 and 2010)

I have existing OWA servers (1 for 2007 mailbox server and 1 for 2010 mailbox server) that exist in offsite location, but we want to move them to our onsite location (HQ) where the other Exchange 2010 servers are.
Is it worth migrating them or would it be better to just create new Exchange 2007 OWA and Exchange 2010 OWA servers on HQ and designate them with the external/internal URLs configured for Outlook Web Access.

No software or hardware NLB's or DAGS
garryshapeAsked:
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Sushil SonawaneCommented:
If your all servers in same organization then you can migrate users mail account from offsite location to HQ.

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garryshapeAuthor Commented:
My proposed steps are:
1. Designate new IP address on destination network for mail servers
2. Setup firewall rules to allow Outside access to new IP (for owa login)
3. Stop Exchange/IIS services on mail servers, configure the new IP address settings
4. Shutdown mail servers and vmotion to destination host/datastore/network
5. Power on mail servers after vmotion, allow services to turn back on and test functionality.
anything else I could be missing?
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