I get always requests about share the shifts from shift scheduler to the phone calendar.
It is a hard work, because an app can`t create appointments on the phone calendar. It need to create a new calendar on the web and the phone calendar has to link with this web calendar.
I am trying something new. If you want to see your shifts in your phone calendar, you need the sync-addon. Once you have the sync-addon and created a calendar ID, you can try this tool (for test-purpose only!) and see your shifts in your phone calendar:

Calendar ID (ID of the shared calendar):
Friends Password (leave empty if no password was set):
Calendar Name (used for Outlook calendar name):

This will give you the possibility to subscribe a new calendar in your live account.

Want more???

What about a holiday calendar?
Check this to add holidays for Germany:
http://icalshare.com/calendars/5343
or from Italy:
http://icalshare.com/calendars/40
Or from england:
http://icalshare.com/calendars/49
If you like it, I can create a "hack" in the next version, so you will see this holiday calendar with a RED day number also on the calendar for example.
Without feedbacks, I will not create this update ;)