troubleshooting Question

Transitiong exchange 2007 to Exchange 2010 after updating the other servers before internet facing server

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jtanoFlag for United States of America asked on
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I have our main internet facing cas 2007 at our main sight. I had to add exchange 2010 servers to a couple of new facilities in remote sights but they are all connected. I'm now transitioning  our last,  but main 2007 exchange to a new box with exch 2010 (all 2008r2 OS).  I was fallowing  the articles to make the 2007 to work with exch 2010and then realized that won't work because I needed to upgrade this server first before the others.  I had already changed everything on 2007 to legacy.domain .com and the new 2010 to  Email seems to be working fine on the new server and I believe I can move everyone over to the new server that does not access email remotely ( smartphones, owa, etc) I assume then after movng all users over then  I just need to move all the remote users at the same time and change the ip to that of the old server and send connectors?  Am I missing anything.  Right now I have various users still on the old exch 07 getting the whole pop up box to log in to email, ( so I'm guessing outlook anywhere is not configured correctly as all their outlooks are set to "connect using http" or the fact that I changed it to Usually I just have to change their authentication to ntlm and they work okay.

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