Explain how adveristing research and marketing fits into the product life cycle?

there is plenty here. But in your lifetime, think of product life cycle, marketing by Microsoft, and advertising for...

DOS 2.0
Windows 3.2
Windows 3.3
Windows 95
windows 98
Windows XP
Windows Vista
Windows 7
Windows 8
Windows 10

Weren't each advertised as the greatest we could ever want? Didn't advertising research tell Microsoft that folks were looking for the "newest" and best model?
Didn't each in the end give way to a new sales pitch for a newer version?