dear all please i need help i have one domain active directory : mail.??????.?????.info and 2 exchange server exch 1 : 172.16.1.2 exch 2: 172.16.1.3 and TMG SERVER ip : 172.16.1.5 and public ip : ??.??.??.?? how to configure the the both exchange server 2010 as back up means if the exch 1 is down i want the email to go to exch 2 means the both exchange server is up and i want configure OWA with out to buy 3 party certificate in TMG SERVER 2010 now allready the i have installed the 2 exchange server PLEASE HELP ME THANKS

You can always have One InterFacing CAS Server But if you want Server Failover to happen You should go for High Availability Solutions. CAS array for Client Access Server DAG for Mailbox Server --- Assuming you are having All roles installed on the Same Server Microsoft Network Load Balance won't work for CAS array. You should Use a 3rd party NLB DAG will work complelety fine Satheshwaran Manoharan | Exchange 2003/2007/2010 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you

thanks for your replay but how i configure CAS array for Client Access Server OR High Availability Solutions

You Asked me a 15 Page Document in 2 Lines Just kidding ----------- Watch this video - To get some idea about CAS array https://www.youtube.com/watch?v=Z7eeSC_iHR8 ---------- Creating DAG for Mailbox Server http://technet.microsoft.com/en-us/library/dd351172.aspx -------- If you have Servers Ready Start Creating a DAG first , Finish the Easy part. Satheshwaran Manoharan | Exchange 2003/2007/2010 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you

thanks alot for your help