That's the short answer.
I've never seen a web site cause a browser to pop up with a message saying the browser has expired. Can you be more specific with the error messages?
I ask because I know users who are still using IE6, and they have little reported problems. In fact consider this; IE9 is not available to XP users, so web sites that attempt to force a change like that would soon lose millions of existing XP users.
I will always update Windows whenever updates are offered. It keeps my system up to date which causes fewer problems in the long run.
Also, the problem with forums and reviews are that people generally only report problems. You won't see many 'thread starter' posts where users say, "I upgraded to IE9 and all is well". There are now millions of happy IE9 users.
If you do experience problems with IE9, you can always revert back to IE8. Just be sure you have another working browser installed so you can find out how to do that.
I hope that helps.
I have a Dell Vostro 1510 laptop with Windows Vista Premium, my current Internet browser is Internet Explorer 8 which has worked very good. The last few weeks I've been receiving these pop up messages when I sign into my webmail accounts that my current browser has expired and I need to upgrade to Internet Explorer 9. I received a message from Windows Update yesterday saying one update was currently available, the update was Internet Explorer 9, 18.0MB.
I've just finished reading through many posts in the browser's forum, many saying they are not pleased with making the switch to IE9, many said they have encountered problems with IE9, should I still make the switch from IE8 to IE9 or can I stay with IE8 and ignore these messages? I also have a Dell Dimension 3100 desktop PC with Windows Home XP SP2 which also has IE8.