More issues with IE9
Microsoft is now investigating the problems with IE9 and MMC.
Like with TMG and IE9
http://msmvps.com/blogs/wssra/archive/2011/03/24/do-not-install-ie9-on-tmg.aspx
there is an issue with the Exchange 2010 Management Console when you’ve installed IE9.
Because IE9 is now on the list for Windows Updates to be installed automatically, more administrators will be faced with this issue. So think about disabling automatic IE9 installation on TMG and Exchange Servers.