Well there was the Microsoft Courier back in the day. https://gizmodo.com/courier-first-details-of-microsofts-secret-tablet-5365299 https://gizmodo.com/courier

Well there was the Microsoft Courier back in the day. https://gizmodo.com/courier-first-details-of-microsofts-secret-tablet-5365299 https://gizmodo.com/courier-first-details-of-microsofts-secr... Like their attempt at tablets with XP, they seem to have been a little too early.