Not every PC with a Windows 10 upgrade reservation will get it on July 29

[Windows Central]

Microsoft is now less than a month from officially launching Windows 10 on July 29. However, the company has just revealed that even if you have reserved your current Windows 7 or 8.1 PC to get the free upgrade to Windows 10, you might not get it on that launch date.

Full story from the WindowsCentral blog...