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Exchange 2007 Replication to Exchange 2010 over a VPN

Netexperts
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Hi Guys,
We are looking at redoing our internal network and we have our company split into 2 businesses. We have 2 new servers with Server 2008 R2 Enterprise on and are looking to put one of them in our office with Exchange 2010 on it and the mailboxes of the local staff and the other in a remote location (with better internet connection) with Exchange 2007 on it and mailboxes for our other company. I haven't used the new replication feature as yet and wondered if someone could tell me if it would work between 2007 and 2010 over a VPN and also what it would allow me to do from a redundancy point of view with the setup we have planned (if anything at all). Sorry this is a bit vague.

Thanks
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SteveArchitect/Designer

Commented:
Just to confirm, are the two 'companies' using the same email domain or two different ones?
Also will they log onto the same domain or have independant, seperate Systems.

Replicating anything across a VPN can be a little slow or slow the internet down, so would depend on how much traffic you expect to flow between the two systems.
If they are on the same domain and sharing the same 'system' they will really struggle unless you have a good internet line at both ends (dont forget upload speed as well as download)

Author

Commented:
Both companies will be using the same domain with a static VPN between the servers. we are planning on using the Exchange 2007 box for the email for one company (as a lot of them are remote users) and the Exchange 2010 for the others (that will be in the same building as the server) so in effect having 2 seperate email domains with one AD domain.

Thanks
SteveArchitect/Designer

Commented:
Sorry, bit confused. You say they will share one Active directory but have two e-mail domains?

Will both e-mail servers be managing emails for a seperate e-mail domain each and not be replicating mailbox data between them?

Author

Commented:
This is where i'm a little short on knowledge. We are going to have one AD domain which both servers will be in and each server will handle the mail for that company. So Server A will hold mail for Company A and Server B will hold mail for company B. I didn't know if replication would work so that if the mailstore went corrupt on Server A then we could get a copy off Server B or does the replication work the same as a cluster failover ?
Hope this makes sense.

Thanks
SteveArchitect/Designer

Commented:
OK, I think I'm with you.

So the two companies are seperate and will have different e-mail addresses etc?
john@company1.com
mike@company2.com

Could you advise why you would like them on the same AD domain?
Will users from one site be regularly going to the other etc?

I think you may be better setting both servers up as independant systems on independant domains.
If users on each site need to access resources on the other site you can set up a trust to allow communication between the two sites.

Alternatively, if you set them both up on the same domain you will get some redundancy in your system and each server will back up the others user database. you can also set them to back up each others shared files etc as a simple redundancy system.
The e-mails are a bit more complicated though and may cause a lot more traffic that you may want.Even if one server did go down setting the other up as a backkup email server is quite complicated.

It can be done, but it's a big job.
You may be better keeping it a bit simpler for now until you get more experienced with exchange.
Try these articles

http://technet.microsoft.com/en-us/library/bb124350.aspx

http://msexchangeteam.com/archive/2007/06/28/445538.aspx

Author

Commented:
We were planning on one domain because although the other company will access email on the remote located server they will access server shares locally (i.e on our server) so putting them on one domain seemed the easiest way to achieve this.
Architect/Designer
Commented:
The easiest way to achieve that would be to have a trust between the two independant systems. Setting up active directory replication between two sites can be quite complicated.

Author

Commented:
That's great.

Many Thanks