http://support.microsoft.com/kb/2181579

Important  After you install the December hotfix package for Outlook 2010 and set the DelegateSentItemsStyle registry value to 1, the functionality is available only when the Exchange account is set to Use Cached Exchange Mode. The DelegateSentItemsStyle registry value does not affect an Exchange account that is configured in Online mode. For more information about enabling Use Cached Exchange Mode, see the following article in the Microsoft Knowledge Base:

How to prevent Office 2010 from disabling printers

http://support.microsoft.com/kb/983035

To prevent Office 2010 from disabling printers, set the DisablePrintFeaturesOnCrash registry entry. To do this, follow these steps:

  1. Start Registry Editor.
  2. Click Start
    the Start button

    , type regedit in the Start Search box, and then press ENTER.

    Note If you are prompted for an administrator password or for confirmation, type the password or provide confirmationI.

  3. Locate and then click the following registry subkey:
    HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\General
  4. On the Edit menu, point to New, and then click DWORD Value.
  5. Type DisablePrintFeaturesOnCrash, and then press ENTER.
  6. Right-click DisablePrintFeaturesOnCrash, and then click Modify.
  7. In the Value data box, type 0, and then click OK.
  8. Exit Registry Editor.