I don't know if it is helpful or not, but if i run an "email" backup first i get the "windows must close down CBU" message. But, if i run another backup or even backup my email accounts etc., through the "files and directories" options first, then my email backup runs fine.
This has proved to be consistent over the last few days.
First,you tested just MS Outlook 2007 email backup ,no?
You're saying that if you run a "files and directories" type backup first , and afterwords an "email accounts"(outlook 2007?) type backup it runs ok?
Again,like a said, a problem was found and solved with outlook 2007 backup that could have crashed the program and you're free to test it again on the next release.
Thank You for your feedback.