This is going to be fun. But first, remember, IMing between Yahoo! Messenger and Windows Live™ Messenger requires both parties to use their Messenger’s latest version. There’s version 8.0 of Yahoo! Messenger for you, and a version of the Windows Live user.

If you already downloaded Yahoo! Messenger and they sent you an invitation from the Windows Live™ Messenger, it’s easy: simply accept their invitation. You’ll appear in their contact list, and they will appear in yours.

If you haven’t already downloaded Yahoo! Messenger version 8.0 and your friend has downloaded the Windows Live™ Messenger, you’ll be given a link in your Windows Live™ Messenger friend’s invitation. Do you see it? Click it and follow the instructions, and you’ll be IMing with your Windows Live pal in no time.

If you don’t have the latest version and you don’t see a link to download it in the invitation that was sent to you, click here to get your Yahoo! Messenger.