An unexpected error has occurred in Oulook when sending an email to a distribution list.
When upgrading Microsoft Office sometimes you need to recreate all your distribution lists.
However, even after recreating the lists this error is still displayed.
Reason: The suggested names list is not related to your address book
Solution: When you start to type in the name of the distribution list in the T0: box and it pops up in the list of names press the delete key to delete the suggested name as this is still the old list which does not work. Type in the full name of the list and click the CHECK NAMES key to make Outlook search your Address Book.
Now the email should send ok
If you still get the error after recreating the Distribution Lists make sure you do not have an & in the Distribution List name, if you do change this to an _ and try again