Microsoft originally offered a free upgrade to Windows 10 for Windows 7 and 8.1 users, but this offer expired on July 29, 2016. If you want to upgrade to Windows 10 now, you'll have to pay the full price of $119.99.

2. Windows 10 Home doesn't include all the features of Windows 10 Pro

Windows 10 Home is the basic edition of Windows 10, and it includes all the essential features that most people need. However, Windows 10 Pro includes some additional features that may be useful for businesses and power users, such as:

* BitLocker Device Encryption

* Group Policy Editor

* Remote Desktop Connection

* Hyper-V

3. Windows 10 can be a bit of a privacy nightmare

Windows 10 collects a lot of data about your activities, and it sends this data back to Microsoft. This data can include your browsing history, search history, location data, and more. If you're concerned about your privacy, you can disable some of these data collection features in the Windows 10 privacy settings.

4. Windows 10 can be slow on older hardware

Windows 10 is a demanding operating system, and it can be slow on older hardware. If you have an older computer, you may want to consider upgrading your hardware before installing Windows 10.

5. Windows 10 is still a work in progress

Windows 10 is a relatively new operating system, and it's still being improved by Microsoft. There have been a number of updates and patches released for Windows 10, and it's likely that more will be released in the future.

Overall, Windows 10 is a great operating system, but there are some things you should know before you upgrade. Make sure you're aware of the system requirements, the privacy implications, and the potential for performance issues.