Delete outlook.com calendar

[Andreas Eymannsberger]

My university just switched to Office 365 so I'm having my calendar and mail there. I wanted to add a 'webcal'-calendar and needed a few tries to get the exact settings within the webcal format. I deleted the 'wrong' calendars online - but they won't stop showing on my 920. I already deleted the ActiveSync account on the phone and set it up again. Didn't help. I was able to delete the calendars at outlook.com/... but I don't see how to get rid of them at the phone.
(I do not just want to hide them in the WP calendar app, but just get them out of the active sync account...)

Anybody got an answer?

 

[Andreas Eymannsberger]

Nobody got an idea?

 

[Arcopolo]

same problem, impossible to delete these try-out-calendars ?