If you are getting the following error, “You must close all dialog boxes before you can close Exchange Management Console” when you are trying to close Exchange Management Console (EMC) you have to install some hotfix for IE9, that Microsoft just released.
In order to install the fix, a released version of IE9 needs to be installed on the machine first.
- MS11-081: Cumulative Security Update for Internet Explorer: October 11, 2011 needs to be installed. This can be obtained from Windows Update or – if you need to download it for local network installation, the packages can be obtained here. Please note that the packages for client and server OSes might be different, depending on what you need. The installation of this package is REQUIRED for proper operation of the EMC hotfix.
Then download the hotfix here: