The free Windows 10 upgrade offer is to expire at the end of July. If the company follows through with that plan -- some have speculated that Microsoft will simply extend the deal to maintain the push -- growth will likely slow significantly.
Windows 10's gains last month came primarily from Windows 7, currently the de facto standard in enterprises. Windows 7's user share fell in March to 57.4% of all Windows PCs, a decline of half a percentage point from the month before.
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