I met with a potential client. They have a very specialized business that involves analyzing data on hard drives. The data can take many forms and so they have a multitude of software tools that assist in compiling information. And like most businesses, they have a Windows-based network. But the primary applications they are using are not Microsoft. They are 3rd party, industry-specific applications that are mission-critical. If their programs are not running properly, they are not able to work and not able to run the business.
Would you consider using the cell phone you had in 2000? Think about it. Back in 2000, the early models of the Treo were hot products and by today standards they are very inadequate.
As for me, I am still using Word 2000 and even if you have the more current version, I doubt that there are any features in it that are compelling. Microsoft has a stranglehold on the PC industry. They dominate the operating system and the applications market. They don't have any formidable competitors. Test yourself. Who is Microsoft's biggest business software competition? It isn't Google because Google is giving away their Google Apps. It isn't Apple because Apple is a hardware manufacturer. They don't develop business applications that compete with Office.