Exchange Server issues

Hello To whom it may concert,
Recently i installed windows 2003 server with exchange server 2003. We are
running in mixed mode. After live i am facing lot of problems
1. Cannot access remotely using dial up connection: I an getting error
message as follows " your exchange server is not avilable"
2. Even with in the lan some of the users also getting same message,
I never had any problems with window NT with exchange 5.5
3. Now I tried to browse network computers i am not seeing any computers.
Is any thing is missing on the configuraion.
I can able to send and receive messages with out any problems.
Please help me out


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