Should you upgrade to Windows 10 ?

We copied and pasted the Microsoft Privacy Statement and the Services Agreement into a document editor and found that these "straightforward" terms are 22 and 23 pages long respectively. Summing up these 45 pages, one can say that Microsoft basically grants itself very broad rights to collect everything you do, say and write with and on your devices in order to sell more targeted advertising or to sell your data to third parties. The company appears to be granting itself the right to share your data either with your consent "or as necessary".

Your device location, data from your calendar, the apps you use, data from your emails and text messages, who you call, your contacts and how often you interact with them on your device. Cortana also learns about you by collecting data about how you use your device and other Microsoft services, such as your music, alarm settings, whether the lock screen is on, what you view and purchase, your browse and Bing search history, and more.

Your voice input, as well your name and nickname, your recent calendar events and the names of the people in your appointments, and information about your contacts including names and nickname.

-- https://www.techdirt.com/articles/20150802/07341031825/microsoft-launches-special-scott-mcnealy-edition-windows.shtml

Delivery Optimization downloads the same updates and apps that you get through Windows Update and the Windows Store. Delivery Optimization creates a local cache, and stores files that it has downloaded in that cache for a short period of time. Depending on your settings, Windows then send parts of those files to other PCs on your local network or PCs on the Internet that are downloading the same files.

-- https://www.quora.com/Should-I-go-ahead-with-the-free-upgrade-to-Windows-10-offered-by-Microsoft

However, only some SKUs (stock-keeping units) -- notably Windows 10 Home and Windows 10 Pro -- are set to provide updates and apps to other devices when connected to the public Internet.

Windows 10 Enterprise and Windows 10 Education, volume-licensed SKUs for large companies and organizations, also have WUDO enabled, but default to sharing updates and apps only within a local network.

-- http://www.computerworld.com/article/2955288/microsoft-windows/windows-10-commandeers-users-upload-bandwidth.html