Rather, each software manufacturer keeps track
of their own
version history, even though they may offer several
versions at different price points for different levels
of functionality, or in order to meet
differing technical requirements for proprietary
devices or operating systems.
So even though the formats
differ by
device, if you create a separate eBook to meet the standards for each one, you not only need to regularly update the content, but also maintain multiple
versions of the files.