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Microsoft Exchange on two sites for redundency and ease of access

We are small business with 55 employees. We have two offices the main offices. The main office has 40 employees and the branch office has 10-15 employees. We need to be able to automatically switch servers when there are issues in any of the sites. We have had a lot of issues with whether the past year where the main site has been down and we have no email. There has been times that the branch office has been down as well.  So, I like to know some options that would take care of this issues without the users being effected.
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netcomp
Asked:
netcomp
3 Solutions
 
xDUCKxCommented:
What version of Exchange?  Solutions vary with the different features in the Exchange versions.
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DJ2liveUKCommented:
if you have local internet at both sites then you may like to consider a web based hosted exchange solution this would be more cost effective for the size of your organisation or even go down the office365 route.

HTH.
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netcompAuthor Commented:
The solution has to be local and not cloud.  We don't have Exchange now as we are running Kerio Mail server, but we want to replace with Exchange and it can be enterprise if that's the only way to accomplish this.  I used to work at a company that any time the local exchange server went down at any of the offices, the users would automatically be switched to the mail server in the main office . I guess Exchange was somehow being replicated. At the same time, their OWA was also redirected which was function of Exchange.
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xDUCKxCommented:
Ideally, you'd set up a DAG (Database Availability Group) that was replicated between offices.  DAG's are available in Exchange 2010.

What is DAG:

http://technet.microsoft.com/en-us/library/dd979799.aspx

A how to:

http://technet.microsoft.com/en-us/library/dd351172.aspx

You'd basically have two independent Exchange servers that replicated the Exchange Mailbox stores.  You can break the stores up by the location (Site A Mailbox Store hosted on Exchange Server in Site A and Site B Mailbox Store in Site B).
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Exchange_GeekCommented:
Each version of Exchange has its clustering concept where in there would be automatic failover process configured

link

Exchange 2003
Concept of Exchange 2003 Clustering

Deployment Guide

Exchange 2007

Concept of Exchange 2007 Clustering

Deployment Guide

Exchange 2010

Concept of Exchange 2010 Clustering
[url="http://www.simple-talk.com/sysadmin/exchange/exchange-2010-dag-creation-and-configuration-part-1/" Deployment Guide[/url]

Regards,
Exchange_Geek
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gsmartinCommented:
Exchange 2010 DAG configuration is the way to go, but I would wait for the 2013 which is soon to be released.
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