HA and Load Balancing in Exchange Server 2010

Hi
My office just have 2 servers Exchange Standard 2010 (Licensed). I installed 3 roles on 2 servers (called Ex1 & Ex2). I configured Windows NLB for Hub Transport and Client Access. That 's fine.
But the maibox is seperated each server. Ex1 is main mailbox, so when Ex1 down, mailbox database will down too.
I 've read DAG solution but I just have 2 servers and it 's running WNLB. My office not enough cost to buy Hardware Load Balancer.
Does anyone have a solution for my problem ?
Thank you

Hi,
If you want to use DNS round robin, it is recommended to lower the TTL values of DNS records to 5 minutes.
DNS Round Robin has no automatic server failure detection. If a host goes down, Administrator will need to realize it, remove the DNS Record for the server that went down, and then clients will have to wait for the TTL value on the old DNS record to
expire. 
Here is an article about DNS round robin for your reference.
http://www.shudnow.net/2010/03/17/exchange-2010-rtm-high-availability-load-balancing-options/
Best regards,
Belinda Ma
TechNet Community Support

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