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Merge mailbox store

I have a single domain with 2 Exchange 2003 servers. For disaster planning purposes if one server were to completely fail I want to be able to take a backup of the mailbox store and restore it to the other. The surving Exchange server would contain all of the mailboxes. Could this be accomplished with RSG and the exmerge? Any other options?
Thanks.
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ksharma4
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u can use a third party product which saves downtime "Double Take" for critical services
What you want to do is  possible but there are some gotchas related to this. 1. All information about users are stored in AD like which server thier mailbox is on and the storage group information. So you can not just restore data to a 2nd Exchange server and have it funcation with out a bit of effort.
with that said there are numerous other possibilites for you to use like
1. Clustering
2. 3rd party like Wan Sync HA etc or you have a 2nd server with OS loaded but not Exchange  
3. and you can do an install in DR mode etc...

What is your goal just to be able to recover or limited down time?
How many users to you have on your system?

I believe clustering provides the best solution but requires a higher cost. Exchange 12 will provide features that will allow this to happen however will not be released until 2007.
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My objective is to take the simplest approach possible with the current gear I have. Going to a cluster or providing replicated servers are great options but not currently part of my equation(monies). My situation is made up of two 2003 Exchange servers each with 400 different mailboxes. If I were to completely lose one I want to take my backup and restore the mailboxes to the remaining one creating a server with now 800 different mailboxes. Restoring to the recovery storage group and exmerge sounds like a great approach as this is native to Exchange. Any pitfalls to look out for or is this a straight forward method?
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Atig can you explain step 6 referring to find match? The mailbox store being restored to the remaining server will be different there will be know matching mailboxes.
see the link below for "How to use Recovery Storage Groups in Exchange Server 2003"
http://support.microsoft.com/default.aspx?scid=kb;%5bln%5d;824126

and this for "Using Exchange Server 2003 Recovery Storage Groups"
http://www.microsoft.com/technet/prodtechnol/exchange/2003/library/ue2k3rsg.mspx

Cheers !
The find match looks at the disconnected mailboxes and queried AD to find a user object that corresponds to the disconnnected mailbox.