I agree, the ability to tag OneNotes would be extremely useful. As a matter of fact, it would put the final touch on a complete system of tagging. I have searched and searched and can find no other program that can tag files, web pages and also emails in one system. Tabbles exceeds them all in this. The only thing I am now missing is the ability to tag notes within the same system. That would really be ideal and make Tabbles a system far exceeding any other available.