After the disappointing launches of Windows 8 and 8.1, Microsoft’s latest software, Windows 10, is proving to be a big success, drumming up much press coverage and critical acclaim. 75 million machines are already running this free operating system. Although it offers upgraded multitasking features, a virtual assistant, and automatic updates, some of these additions have brought potential privacy issues into light.

Cortana, Microsoft’s take on Siri, sifts through emails, texts, calendars, and location data to fulfill users’ requests. Although this service offers great convenience, personal data is sent to Microsoft servers, whereas the company reserves the right to share the information with “trusted partners.” Thus, the company can share users’ data with anyone it wants.

 Windows also sends Microsoft non-anonymous diagnostic data, which includes system logs as well as usage information. So, Microsoft could potentially see which applications you use and for how long you use them.

On the bright side, most of these features can be turned off or limited; however, doing so means sacrificing some functionality of Windows 10. Also, to appease consumers and business users, Microsoft is not likely to abuse the statistics it collects. Nothing the company has done is new to the Internet privacy front, but it serves as a reminder that users’ hold over their own data is growing increasingly loose.