The calendar attached is not valid
An invite arrived today from our office365 and the error "The calendar attached is not valid" popped up in Evolution, with body "The message claims to contain a calendar, but the calendar is not a valid iCalendar." Other invites arrive fine, so must be a border case. I've kept the mail (full message source) as a text file. If there's a way to privately upload that somewhere I'm happy to do so.