I'm trying to move away from Google services. I've had gmail accounts a long time, but am moving towards self-hosting.

Such services can be alright for low-use personal email. Where they break down and where Outlook excels is high volumes of mail.

I've had jobs where between automated emails from server monitors, lists I was on and the high volume of discussion we had dropped 900-1200 emails in my Inbox every day. Outlook is the only application that makes that manageable...and I can save all of my mail and quickly search and access all of it.