There is a known issue that causes the following error when our Application Integrations are installed in Office 2010:
"Error Found in Custom UI XML of NetDocuments Integration"
Error Code: 0x800004005
Unknown Office Control ID: TabComposeTools
This issue is resolved with our new ndOffice integration but if you are still using the Application Integrations you can suppress this error in Outlook by going to File > Options > Advanced and un-checking the "Show add-in user interface errors" option. By default this option will be un-checked.