IE9 is no longer in beta, it's a finished product which was "released to manufacturing" (RTM) since earlier this month.
The IE9 update you can see is probably the actual IE9 itself which will update your existing IE8 to IE9. Microsoft update would never offer you any updates which were still beta testing versions.
Nevertheless, this update is optional. If you're happy with IE8, or you mostly use Firefox, you don't have to install it.
The IE9 update you can see is probably the actual IE9 itself which will update your existing IE8 to IE9. Microsoft update would never offer you any updates which were still beta testing versions.
Nevertheless, this update is optional. If you're happy with IE8, or you mostly use Firefox, you don't have to install it.