A humble wish regarding calendaring

With the launch of Microsoft Office 365 and the ease of use of Google Apps I have a humble wish regarding calendaring.  It is simply: Integration!

I attend a lot of meetings both within my organization and outside. Within the organization this works quite easily, my calendar is accessible for everyone in our Exchange environment. However it is not easily available to people outside the organization. That means I get meeting invitations from Doodle.org, Tungle.me, Foodle or simply an email where I am supposed to respond what times are available. This process takes a bit of time and is cumbersome. For me it is  also impossible to reserve timeslots in my calendar for potential meetings, I would simply have no time slots left.

Now for the request. I would like to see a super simple solution of a standardized way to expose my calendar (or the one I choose in Exchange or in Google Apps) to different services. Naturally it should only be the free/busy and for X months in advance. Naturally this should be able to be exposed to various services on the web using a web interface.

It should be as simple as providing a URL, x.x.x.x/username/freebusy/calendar with some type of OAuth style of authentication.

If this is implemented throughout many services one could also imagine ways of exposing different organizations free/busy to all end users in an Exchange  or a Google Apps environment. Or even a federated approach where all universities expose the information with in the federation.

In the end it is these types of quite "simple" integrations that makes life easier (or not) when using different services.