If you're referring to essentials 2011, then it is ****** awful, been waiting for tabbed chat windows for years, but this version is so unreliable, the tab windows are great addition but it runs like a dog, you click on msn window in tray takes forever to open if at all & then it may just crash for no reason, you click on a person to chat takes forever sometimes to open, one of or if not the worst release I've tested this year.