Why does MSN Messenger not have SIP option?

I have built a test domain to create a Live 2005 server.  I have run LCSdiag.exe and am confident that the server is working normally.  After installing Windows Messenger 5.1 on a test client system, I am trying to configure the SIP settings.  On the Accounts Tab, only .NET Passport Accoun and Exchange Account are present.  There is no SIP Communications Service Account option at all.  

I think this may be because I had Communicator client installed on this system, but I have removed it.  On another system without Communicator installed, and using the same install file, I do get the SIP options.  


Does anyone know if Communicator is the reason, and if so, how to I remove Communicator completely to allow Messenger to have the SIP option?
messenger.JPG
dvalcourtAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

dvalcourtAuthor Commented:
Found the registry problem

Need to Enable the key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MessengerService\ServiceProviders\{83D4679F-B6D7-11D2-BF36-00C04FB90A03}
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Server OS

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.