You'll no longer be able to toggle off Cortana with the next upgrade.
http://www.pcworld.com/article/31003...ry-update.html
Total spyware app, IMHO. I have W10 running as a virtual machine on my Linux desktop, and it went into a LONG running three part upgrade last night when I fired up the VM. When I was able to log in, Cortana had magically reappeared and is extremely annoying to turn off. If the same upgrade appears on my in-host version of Windows 10, I'll be ripping it out.
BTW - for those who have suffered an upgrade to Windows 10 from 7 or 8 - the default memory setting is not calculated very well. I found this out when trying to help my uncle get his laptop running with better performance. His laptop only had 2 GB of RAM, and so a larger pagefile was getting defined and being used - slowing everything down. Here's a link on how to adjust/fix a slow running W10 machine after an upgrade. It may help, as my uncle's laptop is running faster now.
http://www.rbrussell.com/2015/02/25/...ing-very-slow/
I'm not sure when his laptop was upgraded, and perhaps more recent upgrades to Windows 10 made the pagefile size more efficient, but in case your system is slow....