I have contacted Microsoft technical support about a problem encountered in closing Oultlook 2010.
Specifically, often oultlook 2010 can not be closed in X button
You must close the process using CTRL + ALT + DELETE.
The answer from Microsoft came promptly: Closing the problem is caused by add-ons. I have indicated the steps to find out what causes this deadlock.
Apparently - Bitdefender Antispam Toolbar - is causing the problem.
Now I disabled BitDefender Antispam Toolbar and made 10 successive closures, I have not encountered any problems.
Hopefully will find a solution by the team of developers.
I use Office 2010 Home and business x64
Best regards,