I'm stuck with Gmail. Getting the services I have free would probably be unaffordable with any other service; I've got two legacy free Google apps accounts; one

I'm stuck with Gmail. Getting the services I have free would probably be unaffordable with any other service; I've got two legacy free Google apps accounts; one has 500 users available with 4 domaine and several subdomains (about 20 active users and 40 inactive). The other has 100 users available, and is used for my personal/family use. I can't see getting this kind of service free anywhere. Not to mention, there's purchased apps from the play store (and other services) on some if these accounts that aren't easily transferred elsewhere.