Why Do People Still Use Microsoft Software?

This puzzles me: why do people still use Microsoft Office, let alone 365? Google exists with so much better options, the online thing is you need internet access if you want it saved to the cloud, but now they even allow offline access if you have the software downloaded. For literally $5 per user per month you get business email on your domain name (group emails like help@owenbick.com are free). They have an app store to make all their applications even more powerful. Their search destroys Bing, their entire business suite is literally $5 a month, assuming you use your own domain. If you use a Gmail email, it's free. Why do people still want to use Microsoft that runs at $175.00 and lacks almost all of these features?