I've long posted on that -- the Free version is as far as I can see absolutely 100% compatible with EXCEL / Word / Powerpoint provided you don't need VBA macros. The paid version (only between 50 - 80 USD supports VBA macros which I'm tempted to try out). The Free version seems quite good even with complex formulae and charts.
There's a great Free LINUX version too. Also the Android version (Free) is fine for tablets / phones.
Note though there's no Email client so no OUTLOOK equivalent.
Download Office Free and Office Professional from Kingsoft Office Download Center
BTW, are you using Home or ProPlus? Which shouldn't make a difference, but I'm on ProPlus.
Heading out to see what's what with this, because sumpin' ain't right!