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upgrading /migrating 2007 exchange server to 2010 /2013

Posted on 2013-06-18
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Last Modified: 2013-07-08
We have single exchange 2007 server with ~ 150 users  150gb mailstore and public folders 50gb+)
What is the best way to gradually upgrade to exchange 2010 /13?
Does I make sense to deploy 2013 or to go with 2010 as a safe alternative?
1.      I have 2008 R2 box ready. what roles should be installed on 2010?
2.      How should I configure public folders to coexist? Relocation?
3.      What is the best way to move mailboxes?
I would appreciate detailed answer.
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Question by:leop1212
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Adam Brown earned 500 total points
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To answer your questions:
1. This depends on how you want your 2010/2013 environment to work. You can install all the roles on the server or separate the roles. It's up to you. If you only have one server available, install all roles on it.
2. Public Folders are migrated through Public Folder replicas when you move to 2010 and by migrating the public folders to a public folder mailbox in 2013. Exchange 2013 changed the way public folders are stored, so there really isn't a way to do coexistence between older versions and Exchange 2013. Any mailboxes on Exchange 2013 will look to a public folder mailbox for public folders and won't see the public folders on the 2007 server. For 2010, you just need to set up a replica of the 2007 public folders on the 2010 server's public folder database after it's created. When that's done, mailboxes on 2010 will look to the 2010 public folder database and 2007 mailbox will look at the 2007 server.
3. Moving mailboxes is done from the Exchange 2010/2013 server through powershell or from the Management console. 2010 and 2013 can both recognize an Exchange 2007 server and move mailboxes from it natively without any external tools required.

http://www.networkworld.com/community/node/47778 has a detailed guide on migrating to 2010. http://www.msexchange.org/articles-tutorials/exchange-server-2013/migration-deployment/planning-and-migrating-small-organization-exchange-2007-2013-part1.html has info on migrating from 2007 to 2013.
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