Question : How do I verify the free/busy replication is working correctly, as I only see random users free/busy information?

I am trying to get the free/busy replication piece of the InterOrg Replication Tool to work correctly.  It appears to be setup correctly, but I only see certain peoples free/busy information.  The only error we get is about redirecting the exchange server.
WARNING: Logon to server abc123.domain.com has been redirected to server [abc123]. This redirection may cause failure to logon to MAPI sessions. Refer to KB article <826449> and change the configuration file.
This kb article doesnt help.  Also, when I try to add new sessions to another location, they never run.  I have added a new .esc with the new sessions and that wont run either.

Answer : How do I verify the free/busy replication is working correctly, as I only see random users free/busy information?

not on the same machine - only one instance of the service will run at a time

if you need to add more sessions - either add them to an existing session (what I did when I discovered the 16 session limit), or configure the I/O Replication service to run on another machine