[graffitici]

I'm also a big fan of Fastmail, and I've been using it for a while with great pleasure. However, I've come to realize that Gmail is really two things: an e-mail service, and and e-mail platform. Fastmail is more than enough to replace the service aspect. But there are so many plugins and startups that use Gmail, that at some point one feels like one's missing out. I'm thinking of things like Streak, Mixmax, Boomerang..

At some point I asked them whether they could "emulate" Gmail's UI, so that these apps and Chrome extensions could run on Fastmail. But understandably this is quite a big task. If they could pull it off, it would be quite phenomenal though..

[EduardoBautista]

This exactly. I moved from Fastmail back to Google Apps (I have an account grandfathered into the free version) because of all the integrations from third party services such as Polymail, Evernote, etc.