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Cybertronnh

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Exchange 2010 to 2013 migration

I am upgrading my email system from Exchange 2010 to 2013.  I have about 2 dozen mailboxes so my 1 mail server handles all functions.  I've installed 2013 into my network and migrated a couple test mailboxes over to it.  Email has been flowing properly to and from those mailboxes for over a week now.  All mail is flowing to and from the internet through the 2010 server still.  I am ready to point my firewall directly to the 2013 server and make it the internet facing server.
So my questions:  from what I've read, once I point my incoming email directly at the 2013 server, I need to create a new UCC certificate with the same FQDN I'm currently using (mail.mydomain.com) on the 2013 server and move my remaining mailboxes.   My mobiles using activesync should not need to have anything done - they should pick up the change at that point - is this correct?  The desktops on the domain will automatically pick up the change as part of the move process - that is simple.  I expect certificate errors on the desktops until the UCC cert is created.  Anything else I need to be thinking about?
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Will Szymkowski
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if you are going to use (mail.mydomain.com) external URL what you r having for Exchange 2010 than there is no need of new SAN certificate you can use same one
@Naushad this has already been mentioned.
if you are going to use (mail.mydomain.com) external URL what you r having for Exchange 2010 than there is no need of new SAN certificate you can use same one

Will.
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Cybertronnh

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A new issue has cropped up.  All users who's mailboxes are still on the 2010 server have been disconnected and I can't get them to reconnect.  All clients are on Outlook 2013.  Outlook is showing "Cannot start Microsoft Outlook.  Cannot open the Outlook window.  The set of folders cannot be opened.  You must connect with Microsoft Exchange with the current profile before you can synchronize your folders"
I got the 2010 issue figures out. I set both servers to authenticate via NTLM, then on the 2010 server I opened the default web site, clicked RPC - authentication, & under providers moved NTLM up & negotiate down.