I think Microsoft uses their own OSes only on high end tablets/PCs and so they never face the problem...
They also do not realize that their OS is larger than any other OS... We can be lucky that they do not let sell 16GB tablets...
The move of the WindowsApps Folder didn't work and I tried it 2 times. After my last try the old apps worked but it wasn't possible to install new apps. You can find tons of posting with the error code I got. No solution. I tried also to find
a solution with process explorer...
Finally I did these things to make my tablet usable :)
1. powercfg /H:off - gave me more than 1 GB diskspace!
2. a - formated my SD-card with NTFS to be able to move Skydrive to it.
b - booted into cmd with Windows 8.1 USB Stick (See Mr_bigworlds post above)
c - copied the usersfolder to SD-card and made symbolic link (See Mr_bigworlds post above)
3. deinstalled the preinstalled office from C:
4. installed "wise disk cleaner" on D: - gave me more than 1 GB diskspace also.
5. All normal programs will be installed on D:!
I hope Microsoft will fix the problem with tablets and make it possible to make the SD-card the default install device.
In times of the cloud even cameras send their pictures to the cloud and nobody takes out SD-cards...