

The thing with Office is Microsoft has worked hard to keep it’s monopoly. Office is it’s cash cow and so they avoid standards deliberately to make it harder to move off. There are plenty of alternatives, lots of email software, etc. It’s just about taking your time and moving bit by bit. You can install LibreOffice and Mozilla Thunderbird on Windows to try them out. LibreOffice being what replaced open office.
Thunderbird is very good and new additions are coming on a regular basis now. You can use it with any standard email service, and soon it will work with exchange and hopefully soon JMAP. There is also a mobile version.