看下面的细节,win 8 与win7的用户,只说第一年免费,一年后怎莫charge 不清楚
Microsoft has just announced the first pricing information for Windows 10 at
its preview event today. The biggest news is that the new OS will be
completely free for current Windows 8.1 and Windows 7 users for its first
year of availability—after that time period has expired, OS upgrades will
presumably need to be paid for as they are currently (though Microsoft was
less than clear on this point, it made no mention of a paid, Office 365-
style subscription for Windows upgrades). The Windows 10 upgrade for Windows
Phone 8.1 users will also be free.