By default (or design? ), Outlook 2010 will place all sent items and deleted items in the user's mailbox. The issue with this is that users of a shared mailbox cannot view what emails have been sent or deleted. In Outlook 2007, you could manually enable this feature by adding a registry key. This doesn't work the same way in Outlook 2010. There is a fix though.
- Request the hotfix from Microsoft found at http://support.microsoft.com/kb/2459115
You need will need to fill out the information to have Microsoft send you a link to the hotfixes. There is one for x64 and x86. (Probably it will included in SP1)
- Install the provided hotfix.
- On the client computer logged in as the user, add the following registry key (based on http://support.microsoft.com/kb/972148):
And if we want mantain in the shared mailbox also the deleted items..
In the mail profile, add each shared mailbox as an account.
Reboot the computer.