Which year was Office (1988) and Visual Studio (1997) knocked out?
Microsoft just stops investing in innovation once they take over a market. You saw it with IE, with office, with windows even.
There was a Word for DOS, but Word for Windows was a port of Word for Mac. Excel started on the Mac (their DOS spreadsheet was called Multiplan). PowerPoint started out as a Mac product funded by Apple, which Microsoft acquired.
None of this can be described as "knocked out by Microsoft in a year".