Users accessing OWA on Windows Vista clients get a Red X in the compose message form body, how can I fix this?

Outlook Web Access users who access their mail on Vista clients get a Red X in the compose message form body. To resolve this issue, apply the below Microsoft updates on the Exchange server/s:

KB 912945: Internet Explorer ActiveX update - Changes the way in which Internet Explorer handles some Web pages that use ActiveX controls and Java applets.

KB 911829: You receive an error message when you try to perform any editing tasks, or you must click to enable the compose frame in Outlook Web Access - Enables a new editor for Internet Explorer. The new editor uses an Internet Explorer "iframe" instead of an ActiveX control.

Note: Applying the hotfixes causes a focus issue in the compose message form; pressing the space bar in the message body brings up the Address Book since the focus is on the "To.." button. For a free correction and details, refer to the following knowledgebase article by Messageware Incorporated: Pressing the space bar in the compose message window brings up the Address book.