Want to Place Replica's of the OAB on all Exchange Servers however there are several listed - Which is the right one or ones to do ?

I am working to get the OAB on all three of my Exchange Servers so each user downloads from their home server.  I have replicas on the One OAB generating server and on one other server.

My questions is this:  I see several OAB instances in ESM and am not sure if I have to create replica's of all of them or just one.  Need to know if all of them are used ?  

I have OAB Version 2
OAB Version 3a
OAB Vesion 4
Offline Address book - xxxxx   - O  in size
Offline Address Book - Fitsvcs Admin Group - 0 in size

Trying to find out what the funciton of each of these is and which one controls what the Users in Cached mode get when they download.    

All the Docs seem to point to the OAB Version 2

Can someone point me in the right direction ?

thanks,
David


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dwlinderAsked:
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jkarnes12Connect With a Mentor Commented:
Each OAB version, corresponds to the Version of Outlook your end user is using, therefore which version they will pull.  You can read more about this here:

http://msexchangeteam.com/archive/2005/08/01/408473.aspx


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Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
You should add a replica for each version

http://technet.microsoft.com/en-us/library/aa998400(EXCHG.80).aspx
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Exchange_GeekCommented:
OAB Version2 / 3A / 4.

That was the simplest one liner answer.
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dwlinderAuthor Commented:
Yes that helped explain the difference
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dwlinderAuthor Commented:
Thank you for your solutions
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