(1) We've had trouble with the enterprise.oft file also.
Unable to get it working on my PC although one other person in our office was able to.
It creates a form that allows you to schedule conference calls directly from outlook.
(2)  What a lot of my users do is set up a permanent conference so the conf number always stays the same.   That way all they have to do is send out an email with the conf number.
I work in our remote center servicing Mitel systems remotely.  I use the AWC at least once a day for data conferences.  I set up a permanent conf so I didn't have to keep setting one up all the time.   Then I got tired of telling people how to join the conf and sending them emails so I bought a domain name so all I had to do was tell them to go the this website and it would drop them right in my conference.   A lot easier than asking for their email.  (
www.dataconference.us/- that link doesn't put you in my data conf since there's something after the '/')  
Ralph