The point about the computer was that they blame the hardware more than the OS. Upgrade their Device and from what I hear they are happy. Change the look of the os and you got problems.
Many companies still use the classic view both for performance and to reduce calls particularly in the past if they were used to w2k or even win 98 to a degree.
Load everything back on the device as previously as long as they can find the on off button on the new device i doubt they will have any problems.