Frankly, I never understood why businesses were invested in the office suite anyway.

Then you've never worked in an environment of many people, where nothing compares to office, and you can be confident the file you send will look the same on the other end. This is crucial.

Considering there are so many good open source alternatives.

Oh really? Let me see some tables in Open Office Calc. Oh, yea, the devs flat out said they will not support tables in Calc because it's "bad practice", and you should use a database app instead.

Sorry, it takes me seconds to setup a table in Excel, and I can do all kinds of sorting, filtering, etc with trivial effort. I'm not setting up a DB everytime I need to ad-hoc sort/filter 20 rows. There are constant annoyances like this with these open source office apps. Counterintuitive ways of doing things (or not being able to do things at all).

Nothing out there compares to Office. Considering the licensing costs for enterprise (where you can have 50,000+ users), if they could eliminate that cost without incurring massive productivity losses, don't you think they would?

Plus you have millions (if not billions) of docs, templates, processes (where automation exports their data into Office apps e.g. Word or Excel), for users or business management to use, perhaps in other apps or systems. Whose going to pay to reproduce all that work in another system?

Plus historically, Office 4 (in about 1997) had tight integration - nothing else came anywhere close. And that's been the case ever since. I know when I copy data from any office app that it will properly support OLE - OneNote will embed an excel sheet (or publisher/word doc) just fine. Try that with Calc, and you get some weird behaviour.

I'm glad to see the competition, but it's got a long way to go to make inroads against office.