If you're rushing over to download the latest Windows 10 Technical Preview, there's something you need to know first about Cortana. It isn't totally surprising, but it's important to note that she's only currently available in U.S. English.
The information is nestled in the system requirements page at the Windows Insider site, and while it's usually a good idea to read things like that before installing anything, in this case it's doubly worth it. There are some other bits and pieces in there that affects folks who use Windows Media Center for example, so before doing anything, go check them out.
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