"sbowne" wrote in message
...
I had a similar problem. After putting on the security updates last night,
Outlook 2007 Beta would not open correctly, showing this error: "Either
there
is no default mail client or the current mail client cannot fulfill the
messaging request. Please run Microsoft Office Outlook and set it as the
default mail client."

I got the same message as Outlook tried to open. Then once the window had
opened, I got "The file ExSec32.dll is incompatible with Microsoft Office
Outlook. Install Outlook again." Windows then requests an error report is
sent to Microsoft and closes the application. :-(