To be very frank .doc or .xls are standerds out there. They are used by 98% of the Office suite users out there whether on Windows or Mac.
It is the standerd.
However, the option to save only as OOXML is a bit wrong, They should have given saving to both OOXML & old office format which does takes out some new features of Office documents.
Oh well, there is only 2 ways of getting Office out there
1) OEM PCs in which case it is Office 2007 OEM edition cosisting of Word PowerPoint & Excel. So it is full version.
2) You buy it, in which case you again get full versions
3) Trial version with this limitation which should not be there. Well, most of the user know which is the easiest & most compatible office suite out there so they will obviously buy or pirate MS office