Nope, Messenger has never had such an option and it's a long-standing request.
There is a few workarounds to prevent this but I would assume you'd reject them all as
they're really quite annoying to setup and maintain. The best bet is to simply tell them
that you wouldn't like to join said conversations in the future.
Microsoft MVP - Windows Live Messenger/MSN Messenger/Windows Messenger
Associate Expert http://www.microsoft.com/windowsxp/expertzone/
Messenger Resources - http://messenger.jonathankay.com
All posts unless otherwise specified are (c) 2007 Jonathan Kay.
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"Viran" <Viran@xxxxxx> wrote in message
> I have some younger family members on my contact list who have a penchant for
> adding all their friends into a mass conversation. Didn't MSN Messenger or
> old Windows Messenger used to have an option where you were presented with a
> pop up asking to accept or deny the mas chat invite?
> Nowadays I find myself being added to conversations with multiple people I
> don't know and who then try to add me to their 'Friends' list.
> Does a feature to confirm a chat invite exist or is there an add-on I can
> get to facilitate this?
> Thanks in advance!