[rmk2]

While Windows 8 total sales might be on-par with Windows 7 sales, the total number of devices is not. This essentially suggests a decline in overall (total) market share for Windows.

[illuminate]

"While Windows 8 total sales might be on-par with Windows 7 sales, the total number of devices is not. This essentially suggests a decline in overall (total) market share for Windows."

Or a shift away from desktop PCs, perhaps?

[adventured]

Do you have industry data that shows the difference between sales and total number of devices? Would like to see it if you have it.

[cooldeal]

Reference? StatCounter data seems to show the opposite of what you're stating.