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How many ways to achieve high Exchange 2010 availability?

I am planning the deployment of 2010 with the high availability (HA) in mind. In order to discuss, I list a few questions. HA means max 4 hours downtime. User community: 150-300.
1. How to achieve HA using Exchange built-in features if I have two Exchange 2010 boxes at the same site?
2. What thrid party software can I use to achieve HA if I have two Exchange 2010 boxes at the same site?
3. How can I achieve HA if I have two Exchange boxes at different sites over 3Mbps WAN link?
Is using Exchange built-in features or thrid party solution still feasible over 3Mbps WAN link?

Thanks.

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richtree
Asked:
richtree
4 Solutions
 
thecomputerdocsCommented:
Check out www.neverfail.com, see if that's something you may be interested in.
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getzjdCommented:
1. Search around for articles on DAG http://technet.microsoft.com/en-us/library/dd979799.aspx 
2.   Doubletake works fairly well
3.  DAG or doubletake
Is using Exchange built-in features or thrid party solution still feasible over 3Mbps WAN link? Depends on the volume of email and the amount of other traffic, but it may be feasible
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
1. Configure DAG with hardware/software load balancers for CAS/HUB HA.

2. You dont need it.

3. Same as 1, but make sure that the latency between WAN links is less than 50ms.
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richtreeAuthor Commented:
Exchange 2010 built-in HA and third party HA (neverfail or doubletake), what is your take given that the user community is 200-300 and why?

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richtreeAuthor Commented:
Oh, by the way, the link for neverfail is www.neverfailgroup.com not www.neverfail.com
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richtreeAuthor Commented:
I mean to assign the points and close it. I am not sure why it is stuck here.
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richtreeAuthor Commented:
Please assign points equally for each answer.
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richtreeAuthor Commented:
Please assign points and close.
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