I have been trying to add the following address (derek@zero-error.com) to a contact I have in Outlook 2010. Every time I try, when I tab out of the entry box, the email disappears. The odd thing, is that when I create an email and start typing this address, it self completes and allows me to send an email to the person. This email address was part of a group email I received and is now stored in my computer's memory. BUT, I cannot actually add him as a contact, at least not his actual email address. I've tried to just click on his email address in the "To" cell and add him as a contact that way. When I do, I receive the following error: "Cannot perform the requested operation. The command selected is not valid for this recipient. Cannot add recipient to Contacts." Does anyone know why this is happening and how I can fix it?