Pressing Ctrl + Shift aligns text right in Outlook and Lync

I'm used to switching languages with Ctrl+Shift, but whenever I press Right Ctrl+Right Shift in Outlook or Lync, all my text gets aligned right and there's no way to revert the effect but Ctrl+Z out of it.

This does not apply to Word. Left Ctrl+Left Shift is not affected. Right Ctrl+Right Shift messes everything up regardless of my key bindings.

Another weird thing I've noticed is that I had some Asian ninja languages installed, which would sometimes appear when switching the layout (various dialects of Chinese), but weren't listed in Text Services and Input Languages. I fixed that by adding and then removing them, as it is described here, but that didn't help the original issue.

Turns out, fixing this was as simple as disabling a single service called Microsoft IME Dictionary Update. Have no idea what it's for (though I know how it got there - corporate Windows installation... bloatwarefest), as there's no description and not much info online (something related to Asian languages), but I haven't noticed any negative effects. Source.