Hi John,
We don't yet offer official support for Tablets running Windows 7/8. However, we have received a few support cases where users have been using Windows tablets, and from the feedback they have given, it seems they are able to use Method without issues. Please understand that again we don't officially support Windows Tablets currently, so there could be issues we don't as of yet know about. Also, although I don't have much experience with Windows Tablets myself (go Android!), I believe there are different versions, mostly Windows RT and regular Windows. Windows RT are designed specifically for mobile devices, so there might be some issues attempting to run Method on these devices.
On a side note, I actually helped one Method User install the Method Outlook Plug-in on their Tablet (they had a regular version of Microsoft Office with Outlook installed on the tablet). The installation was successful, and I stayed on the call long enough to see that the our plug-in was able to communicate with Method. I haven't heard from this Customer since to see if they have been continually using it, although that could be a good sign.
Method Users - Any of you out there reading this post, have you used Method from a Windows Tablet? Do you have any feedback for John if you have?
-Ben