Re: It works...
> as long as they work nobody really cares if they are proprietary
This is less of a problem now but through the 90s 'making it not work' was one of Microsoft's ways for increasing revenue. A new version of Word or Excel would introduce changes in the format which failed to work correctly with the previous version. This meant that if one person in a group updated then everyone needed to buy the upgrade regardless of whether they wanted any new features (or in the case of the ribbon, did not want them).
It is for this reason that open formats are important. Microsoft is less aggressive _because_ users were switching to open formats to avoid the 'format change' trap.