The emphasis should be on the operating systems and not in the hardware.
I have a tablet 500 HP that uses windows 7 which we use to complement the network of computers that we have at home.
We also have a KVM that allows me to hook up the Tablet and get immediate access to the keyboard, DVD, the big monitor screen and mouse. The Tablet is good to read the internet from the garden under a tree because of the glare, video conferencing and short typing but will not replace the PCs and laptops that we have.
By using Windows 7 we have access to all the software that we are very comfortable with like ooVoo for video conference, Flash for the internet, Adobe PDF reader, Norton security and purchased MS office that we installed very easily from the DVD under the KVM.
The emphasis should be on the operating systems and not in the hardware. For us having a standard OS in our network is a big plus because you can switch from the PC to the laptops to the tablet and you know how to use them all.
Like always MS is behind the OS development for this mix environment but with time they will be there.
What is important to MS is to have a clear, easy and economic way of upgrading all the PCs in the network to have them all at the same software level.