Now that its fixed, it adds a link to try out the pre-release "Outlook" client. It drops the Win8 metro style, and uses the Outlook365 web style. Eh... I've gotten to like the simple metro style. but there are things I'll use like delayed send. so, I probably stay in the "new outlook"
yeah, neither "settings>apps>Mail and Calendar>repair>reboot" nor "settings>apps>Mail and Calendar>reset>reboot" didn't fix it here either...
but, the Store>search>Microsoft Mail and Calendar>Update *did* fix the issue.