Original link: http://www.msoutlook.info/question/421
Shutdown changesDue to shutdown changes in Outlook 2010, the add-in will indeed no longer prompt you to backup when closing Outlook. You can either backup the pst-files manually, wait until an updated version will be released or apply the registry fix mentioned below.
When adding the following key to your Registry, you’ll change the shutdown behavior of Outlook 2010 back to the shutdown behavior of Outlook 2007 SP2.
Note: If you do not want to edit your registry manually, you can also apply the reg-file in this zip-download.