We want to introduce Exchange 2010 in our organization.
We have 2 locations:
- Main location has 2 ISP links used with one Forefront TMG 2010 (100 people on site)
- Second location has 1 ISP link with normal router (from 5 to 20 people on site, depending on which location will be chosen for 2ndary).
We also are Microsoft partners so we have some Microsoft licenses for free which is:
2 x Exchange 2010 ENT
What would be the best way to go from here considering that:
- We need redundancy for hardware (if our servers in main locations go down, we would like people to use our secondary location - even people that are in the main location),
- We need redundancy for ISP (if our main location looses Internet access people from outside/2nd location should be able to access their mailboxes in secondary location without problem, and all emails should be comming there),
- We need redundancy in case of power failure which basically means similar situation to hardware failure.
Good to know:
- There's permanent VPN tunnel with one ISP link between 2 locations
- We have two AD controllers 2008 R2 in main location and no AD controllers in 2nd location
- There are about 170 people working from home / other sites / client workplaces
What we can eventually do if necessary:
- Setup AD in secondary location,
- Buy few (1,2,3,4) additional licenses (preferably later on then in the beginning, but if it will be problematic to extend things as we go) the more licenses we have to buy the bigger problem it gets (this is supposed to be cost-effective :/)
What we need:
- If location A servers go down all users can use their mail as normal from location A and B and from Internet
- If location A internet links go down mails need to keep on coming (2 x MX records - 1 per location?) to second location and people in location B and Internet can still work on their emails, when location A connects back up no mails are lost and things get back to normal..
I would like to achieve best possible solution we can get in terms of redundancy and operation results. I would like to use DAG and 2 entry points (1 MAIN, 1 SECONDARY) in case of link problems and any power/hardware failures. Costs does matter.
PS. I asked similar question a while back but licenses have changed so this may affect your judgement.