You can, but Windows Messenger doesn't work properly on Vista and is not supported,
regardless if Live Messenger is there or not.
Specifically one major incompatibility occurs when a scroll bar appears in a conversation
window in Windows Messenger as the client crashes.
Microsoft MVP - Windows Live Messenger
MSN Messenger/Windows Messenger
MessengerGeek Blog: http://www.yqcomputer.com/
Messenger Resources: http://www.yqcomputer.com/
(c) 2009 Jonathan Kay - If redistributing, you must include this signature or citation