I don't want to have to change the OS on my phone to get an acceptable experience. I rather do something else with my time. But I use fastmail for mail and cal

I don't want to have to change the OS on my phone to get an acceptable experience. I rather do something else with my time. But I use fastmail for mail and calendar. It works great for me. I still have like 10 years worth of data in Google Mail. So it will take some time before I can completely release that.