We are working with an external party and need to see each others calendars. We have tried Doodle.com, but they do not yet support Outlook 2013 (which we are using). The perfect solution would be a service where I could connect to our Exchange 2007 (!) server and then get my calendar from there directly, and the same for the rest of my team.
We have tried to publish the calendar (ICS file) to icalx.com and the subscribe from there; appears to not work (not getting updates). And this method requires Outlook to be running as far as I can see.
Does anybody know of such a service?