SBS2011 Temporary Mixed Domain and Workgroup Working

I am currently changing a small business system from Linux Server with Windows XP Workstations running as a workgroup to SBS2011 Standard server with Windows 7 workstations running as a domain but I have to maintain all system functions - file-server, Internet Access, email etc. - at all times during business hours. I have a problem...

1. When I run ConnectComputer to add the workstations to the SBS domain the DNS records for the mail server will be pointing to the mail servers of an external provider from which users currently gather their email by POP3. I have altered the email account settings of the POP accounts on all of the workstations to include the external servers as IP addresses rather than names, so email gathering from those POP accounts will remain possible after the connections are made to the Exchange system. ConnectComputer will add accounts for the in-house Exchange Server system and internal email messages will begin passing through that system immediately. The question is - Can the existing POP accounts on the external email provider be run in parallel in Outlook with the new Exchange accounts until the DNS records are changed and the Exchange server becomes the authoritative server for the mail domain and can I then import the POP mail from the workstations to the Exchange system?

Ed Form
ed-formAsked:
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Cris HannaConnect With a Mentor Commented:
Ideally you would run the POP3 connector in Exchange 2010 to pull the email from the POP3 provider directly into their Exchange mailbox...then when you're ready to change the External DNS to point to the SBS server, you just remove those connections in the POP3 connection wizard.

But you can running multiple email accounts in Outlook at the same time
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ed-formAuthor Commented:
I was labouring under the delusion that the POP3 connector still has the long minimum refresh time it had in SBS2003. My clients regularly exchange documents with other solicitors and need to complete them and email them back as fast as possible so that the long delay would not be acceptable. I have just checked up on this point and it appears that the POP3 connector now has complete freedom of refresh time so this is the answer. Many thanks.
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