VERY WORST ! Calendar always forgets your local calendar, eats dates (preferably birthdays), does have a 3day-view but not a one week view, doesn't show you the month you're just looking at etc etc etc. Mails: got less bad in the last year, but even k9 mail is better. Replying to an email is confusing, super slow, unusable when network connection is bad because app seems to send every single keystroke to mothership.