Have very recently moved over to Fastmail from a hosted Exchange service (personal - own domains). Very pleased so far although my only issue was that I couldn'

Have very recently moved over to Fastmail from a hosted Exchange service (personal - own domains). Very pleased so far although my only issue was that I couldn't get SRV records to work properly on my domain (the DNS is at cloudflare, and I'm more than certain it was my own incompetence) which made setup on my iPhone a bit of a faff for calendar, contacts and mail compared to exchange. The web-interface is excellent for mail and calendar - for work I have to change between browsers and OSs regularly and it's worked perfectly with all combinations I've come across so far. Also very interested in the work they're going with JMAP as hobby projects of mine have led to me running my own mail servers and developing clients, and this new protocol looks very straightforward and lightweight.