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Do OAB have to be on exch 2010 server

I have an exch 2003 with about 2500 users and we are getting ready to migrate the users over to the exch 2010 server. This process is going to take about a month and half or so. So the exch 2003 and 2010 are going to be running together for some time. My question is, do I need to change the OAB generation to point to the 2010 server or leave it pointing to the 2003 server by creating a new OAB?
Also, what is the easiest way to migrate the public folders from the 2003 to the 2010 server and can I do that now since users will be using both exch 2003 and exch 2010 for some time until the migration is complete.
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vmich
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vmich
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Hendrik WieseCommented:
You don't have to OAB generation to point to exchange from the start. But it would be good to do it as you would have to do it at the end anyway. Have a look at the following for you address list conversion: http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/

Should you run into any issues with the OAB please go through my trouble shooting article and let me know if it helps: Global Address List (Exchange 2003 + 2007 + 2010) + Outlook 2003-2010 common Issues and Solutions

With regards to migrating public folders please do the following: Reference

Step 1: Replicating Exchange 2003 PF's to Exchange 2010
 
Add the Exchange 2010 server as PF replica partner for the Exchange 2003 server PF's:
 •From the Exchange 2010 server: .\AddReplicaToPFRecursive.ps1 -server "Exchange 2010 Server" -TopPublicFolder "\" -ServerToAdd "Exchange 2010 Server"
 
If you are planning to have multiple Exchange 2010 PF servers, you can repeat the Cmdlet above to all of them.
 
Replicate the Exchange 2003 Public Folder hierarchy and content to Exchange 2010 server using ESM (Exchange 2003 System Manager), and then (if you have multiple Exchange 2010 PF servers), replicate the Public Folder hierarchy and content from the Exchange 2010:
 •From the Exchange 2010 server: Update-PublicFolderHierarchy -Server "Exchange 2010 Server"
 
Step 2: Moving Exchange 2003 PF's to Exchange 2010
 
As a last step, after you confirmed that all the PF have been replicated to the Exchange 2010, you can move all replicas from Exchange 2003 to Exchange 2010. The "move all replicas" will actually remove the Exchange 2003 replicas.
 
To move all Exchange 2003 replicas to Exchange 2010, which will actually remove the Exchange 2003 replicas:
•From the Exchange 2010 server: .\MoveAllReplicas.ps1 -Server "Exchange 2003 Server" -NewServer "Exchange 2010 Server"
 
 Additional Cmdlets
 •To view a list of the replicas in the public folder hierarchy: Get-PublicFolder -recurse |fl name,replicas
 •For System Folders: Get-PublicFolder -recurse \non_ipm_subtree |fl name, replicas
 •To compare content replicated between the source and destination servers: Get-PublicFolderStatistics

If you have any questions about the steps above with regards to the public folder please have a look at the comments added by users at: http://blogs.technet.com/b/agobbi/archive/2010/08/04/how-to-move-public-folder-from-exchange-2003-to-exchagne-2010.aspx
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vmichAuthor Commented:
So as far as  the pubilc folders go, do I have to wait until all users are migrated over from exch 2003 to exch 2010 or can I do this now and the users from both exch 2003 and exch 2010 will be able to access the public folders at the same time?
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Hendrik WieseCommented:
No you don't have to wait. They will be able to access it.
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Hendrik WieseCommented:
You can follow the following article during migration, it covers everything to get you up and running: http://www.petenetlive.com/KB/Article/0000234.htm
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
As a best practice, move the OAB to the 2010 server before migrating users.

You can configure replication before migrating and then wait for it to finish OR configure replication (let it run in the background) and point 2010 mailboxes to 2003 PF.

Mind you that OWA 2010 won't connect to 2003 PF in this case.

Check http://www.howexchangeworks.com/2011/09/public-folders-in-exchange-20032010-co.html for more info.
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vmichAuthor Commented:
Is this going to work with both servesr exch 2003 and exch 2010 being online for about 1-2 months, the time it is going to take to migrate all of the users from exch 2003 to exch 2010?
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Hendrik WieseCommented:
Yes it would as long as the PF are replicated.
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vmichAuthor Commented:
solved
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