If you have installed the Windows 10 Technical Preview, you also gave permission to Microsoft to collect data of your usage and report that back to Microsoft as feedback to improve the product. Closer examination of the code shows that you could be sending data in real time as you type.

Microsoft collects information about you, your devices, applications and networks, and your use of those devices, applications and networks. Examples of data we collect include your name, email address, preferences and interests; browsing, search and file history; phone call and SMS data; device configuration and sensor data; and application usage.

This isn't the only thing Microsoft is collecting from Insider Program participants. According to the Privacy Policy, the company is collecting things like text inputted into the operating system, the details of any/all files on your system, voice input and program information. One of the more interesting bits of data the company is collecting is text entered. Some are calling this a keylogger within the Windows 10 Technical Preview, which isn't good news. Microsoft is collecting data on text entered as is it trying to improve auto correct within the system, however I don't think many users will be happy with Microsoft watching text being inputted into the system. One concern would be whether or not Microsoft can see when you input a password or bank details.