Error message: Unable to cast COM object of type 'Microsoft.Office.Interop.Outlook.ApplicationClass' to interface type 'Microsoft.Office.Interop.Outlook._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063001-0000-0000-C000-000000000046}' failed due to the following error: Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)
Cause: This issue is caused by a leftover registry key if you have downgraded your version of Microsoft Office from either Office 2010 to Office 2007, or Office 2013 to Office 2010 or 2007.
Solution: This issue can be resolved by deleting an invalid registry key left over from the higher version of Office. Follow the steps below that pertain to your scenario:
If you downgraded from Office 2010 to Office 2007
Close all Office applications (Outlook, Word, Excel).
Click your Windows® Start button, either click Run or go to the Search box on the Start Menu, and type regedit. The Windows registry editor opens.
Navigate to the following key: HKEY_CLASSES_ROOT\TypeLib\{00062FFF-0000-0000-C000-000000000046}\9.4
Delete the 9.4 key.
Close the registry editor.
Restart the PC.
Reopen Outlook and test with B1P&D.
If you downgraded from Office 2013 to Office 2010 or 2007
Close all Office applications (Outlook, Word, Excel).
Click your Windows Start button, either click Run or go to the Search box on the Start Menu, and type regedit. The Windows registry editor opens.
Navigate to the following key: HKEY_CLASSES_ROOT\TypeLib\{00062FFF-0000-0000-C000-000000000046}\9.5
Delete the 9.5 key.
Close the registry editor.
Restart the PC.
Reopen Outlook and test with B1P&D.
If you downgraded from Office 2016 to 2013
Close all Office applications (Outlook, Word, Excel).
Click your Windows Start button, either click Run or go to the Search box on the Start Menu, and type regedit. The Windows registry editor opens.
Navigate to the following key: HKEY_CLASSES_ROOT\TypeLib\{00062FFF-0000-0000-C000-000000000046}\9.6
Delete the 9.6 key.
Close the registry editor.
Restart the PC.
Reopen Outlook and test with B1P&D.