SBS 2008 Exhange 2013 MIgration

I have a situation where I am migration users from and SBS 2008 (Exchange 2007) to a new Exchange 2013 box. Now I have started the migration of the users and the users that are office based and the are fine as their Outlook when started after the migration picks up the new location of the users mailbox on the new Exchange box and it works fine. The company has a large number of mobile users that connect via OWA and of course use their various mobile devices to read their emails. If I login to the OWA it is the still existing SBS OWA and so I can login as normal with any user that has not been migrated but if I try with a user that has it throws the error ‘Outlook Web Access is currently unavailable.’ My problem is that there are too many mobile users to migrate over a weekend and I cannot afford any downtime for them so I need both migrated users and non-migrated uses to be able to use OWA.

Just as an aside in the Exchange 2013 Admin centre under servers I have not added the External URLs yet for the company or the company’s certificate (not a self-signed one but a proper one)

Hope this makes sense
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Luis MouraCommented:
Can you access to OWA internal (2013 OWA)?

Outside i guess you need to publish.
QuarmAuthor Commented:
I have just discovered that when I access the internal 2013 OWA and when I put in a user that is on the old SBS system it redirects me to the old SBS OWA. If this is the case then if I re point the OWA port on the router to the new 2013 box then should then both old and new users be able to login and will this work for the mobile devices too?

Luis MouraCommented:
If you change on firewall you will lost conections with old OWA, but you can create a new rule and point to new one.

But if you test internal, with a user that exist in database mailbox on exchange 2013, OWA works?
QuarmAuthor Commented:
What we had to do was

1. Re point the current IP and port to the new Exchange box which uses
2. Use a second external IP which we attached to and use that to link to the old SBS Exchange

By doing the above it allows both OWA's to continue working and all you have to do is use mail or remote depending if the user has been migrated or not

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QuarmAuthor Commented:
Because this is exactly how you need to do it
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