SIP choice is not visible in Windows Messenger

Hello,

My society use Live Communication Server 2003 with Windows Messenger 5.1 for
client.
I installed 60 computer with this service and there are ok.
But since one week I add a new laptop with Windows Messenger but the
Tools/Options folder don't have the SIP choice, why ?
Have you a idear ?

It's on Windows XP Pro pre-installed on laptop.

Regards


.

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