See the instructions from the Messenger Geek, Jonathan Kay. It is possible to uninstall these programs, but it doesn't look like fun.

However, since this is an early beta, I wouldn't rush to try any of them - especially not with Windows XP. They will probably have a common installer, and the whole shooting match is designed to come together with Internet Explorer 8 and Windows 7.

These are designed to look lovely and offer a much better user experience to start with, rather than deliver loads of functionality to start with. Select Mail and and the other apps that you want to uninstall, and then click Uninstall. Click Remove one or more Windows Live programs. In the Uninstall or change program list, click Windows Live Essentials, and then click Uninstall/Change. Right click Windows Live Mail and select Uninstall. To delete or remove an email account from Windows Live Mail, first right-click your account. Open Start menu, look for (or type) Windows Live Mail. I suspect all the other Wave 3 services will go the same way, including Windows Live Messenger, Mail and Calendar, Writer, Movie Maker, Photo Gallery, Outlook Connector, Family Safety parental controls and more. This tutorial assumes youve already launched Windows Live Mail. Microsoft is now rolling out Windows Live Wave 3, and if you use Hotmail, you've just been upgraded with no way back. I installed Windows Live Messenger Beta and I hate it - mostly because although it displays my personal emoticons on my chat partner's screen, it refuses to show them to me! However, when I tried to remove it using Add/Remove Programs, it runs its installer, which gives me the option of adding other things, but no option to uninstall it.

How to remove windows live