How can I sync my Office365 Calendar (2013 preview) with my calendar/contacts?

I currently use Office 365 in the preview version of Office 15. I registered for and own a Lumia 920. The contacts of my Lumia and my account are synced perfectly, but when I try to open a contact in Office 365, I can't access my contacts. Does anybody know how to solve that? When going for files->Offic account in Office 365, it shows my Windows Account's mail and my dropbox under "Connected Services". How can I solve that? :(