Sure, you can have Microsoft Office but that is subject to too big of a price per license and you cannot use it anywhere unless you bring your desktop or laptop. But Office 365? Well, we are talking about the cloud here.
And there are many advantages of using Office 365 cloud services themselves. Because the software is running in a Microsoft data center, you simply connect to the Internet to access the Offices software. And when your data is saved, you simple have one data source stored in one location.
With Microsoft taking on all the responsibility for security and reliability, you as the user do not have to worry about these critical issues. Same as when your hosting when there will be problems, the hosting provider will be the one to take care of issues. This is one of the huge advantages. Sure, you pay for it but it does not cost much rather than hiring your own personal team to handle these issues. And they cost more.
Using Office 365 can also help increase productivity. Whether it is an administrator setting up a new employee or a business analyst writing policy and procedure documents in Microsoft Word. When the technology gets out of the way and you can focus specifically on you need to do, you become more productive. Seriously.