Microsoft exchange server unavailable after change IP

[ElpidioValdez]

Hy: Please I need help soon
I change the Ip number for Internet Service Provider (AT&T) (AT&T send instructions) . The server work, de machines can surf in internet but when I want open outlook de system say "your microsoft exchange server is unavailable"

 

[ShackDaddy]

Your DNS (or WINS) server must still have the old address mapped to the server's name. You need to change your DNS entry to match the new address, and then you should be able to find your Exchange server again. I assume that it's hosted by AT&T? Maybe not. Try going to a command-line and typing 'ping exchangeservername'. See if it goes to the right address. Now try 'net view \\exchangeservername' If the first one succeeds and the second one doesn't, your problem is probably with WINS. If the first one fails, it's with DNS. If you don't know how to modify DNS, you should call AT&T's support line and explain your problem.

ShackDaddy