Outlook Web Access – Unable to compose email or reply

Symptom 1 
On a computer that is running Microsoft Windows Vista, you cannot 
perform any editing tasks that you typically expect to perform. For 
example, you cannot perform the following tasks: 
1) Compose a new e-mail message 
2) Reply to an e-mail message 
3) Create a new contact, task, note, journal entry, or appointment 
4) Change any configuration in the Outlook Web Access options folder 

Additionally, you may receive an error message when you try to perform 
these tasks. 

Symptom 2 
On a computer on which you have installed update 912945, you must 
first click one time in the compose frame in Outlook Web Access before 
you edit text. For more information, click the following article 
number to view the article in the Microsoft Knowledge Base: 
912945  (http://support.microsoft.​com/kb/912945/ ) Internet Explorer 
ActiveX update 

Symptom 3 
On a computer on which you have installed security update 912812 that 
is described in security bulletin MS06-013, you must first click one 
time in the compose frame in Outlook Web Access to activate the edit 
control. 

To resolve install the Microsoft patch 911829 on your Exchange 
servers. Click here for link to download page.