If you've reserved your copy of Windows 10 and are keenly awaiting its 29 July release, don't get too excited, because you may have to wait a little longer.
Microsoft is offering free Windows 10 upgrades to non-enterprise customers who are currently running Windows 7 or 8. They'll need to upgrade within a year, but once upgraded the operating system will be kept up to date for "the supported lifetime of the device," according to Microsoft, and that includes "new features when they are ready."
But the company warned last week that everyone won't be getting Windows 10 at the same time.
First off the rank will be Windows Insiders - people who have been running the pre-release versions of Windows 10. They're in line for access to the release version on 29 July.
Then the new operating system will be pushed out in "waves" to those who have reserved copies, but only once "our compatibility work confirms you will have a great experience."
The good news is that "In our testing of millions of systems, we’re seeing full compatibility today with the vast majority of Windows 8x and Windows 7x systems."
100% compatibility isn't always necessary, and "For most upgrade incompatibilities, you may still choose to complete the upgrade." In other words, if you're warned that one or more of your existing applications doesn't work with Windows 10, you can go ahead with the upgrade and then install replacement or updated programs.
If you decided to wait until the arrival of Windows 10 before buying a new Windows PC (rather than rushing in at the end of the last financial year), Microsoft is providing retailers with copies of Windows 10 to upgrade computers in stock that left the factory with Windows 8.1 installed.
Another aspect of the rollout is that Windows 10 Pro and Windows 10 Home will be available on 29 July. Windows 10 Enterprise and Windows 10 Education will be available to volume licensing customers on 1 August.