Hmm, I&#x27;ve found fastmail to be generally buggy.  The latest incident is their calendar doesn&#x27;t interoperate with outlook; fastmail was off by an hour from an exchange invite.  (And while the exchange invite did look correct to me, if the bug is exchange&#x27;s the problem is fastmail&#x27;s given the relative market shares.)<p>CalDav is also shoddily implemented; for example, on android using fastmail&#x27;s recommended 3rd party caldav sync, creating a meeting on your phone (calendar client using caldav to sync to fastmail calendar) will not send meeting invites.  Surprise!<p>FastMail&#x27;s message compose is also unusable on mobile firefox if there is quoted text in the compose area.<p>I use it because I&#x27;m removing google products from my life; you should just watch for the above bugs.