Wants to Monitor Microsoft Exchange 2000 Mail Queues

Hi ,

I am using OpManager for monitoring Exchange 2000 server.
right now i am minitoring CPU utilization, Memory Utilization ,Disk utilization and And all Exchange related services.
But i also want to monitor MTA Queues, InBound , Outbound Messages, Outgoing mail size.
I have added these counters in application monitor. but its not communicating with exchange 2000 server.
We are planning to implement this tool in Cairn Energy India Pty. ltd.
But i want to test every counters before saying yes to our management.
So plz let me know how to monitor Exchange 2000 mailbox and mail queues.

Regards
RAghib
Sr. System Administrator