troubleshooting Question

Exchange 2007 to 2013 - new servers and migrating users

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paulfoel asked on
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Current setup is

One Exchange 2007 physical machine. Only 400 users - amount of data approx 500Gb.

My client wants to upgrade to 2013 and have redundancy (sticking with physical). I was thinking two mailbox/CAS servers with DB copy on each.

The way I see it:-
1. Build two new Windows servers.
2. Install Exchange 2013 on both and create DAG (Can I do this with 2 or do I need an additional file share witness?)
3. Set up, 5 DBs replicated on each other.
4. Link in old 2007 system into DAG.
5. Migrate mailboxes.

Client has asked if it can be done in 5-6 weeks. Seems reasonable to me?

Any comments?
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