Is there a solution that creates a subscribe to calendar link?  Specifically looking for Projects calendar (but also the Calendar app would be helpful too).  I have not seen it.

I don't want to confuse this with Calendar Sync for Outlook. I've seen that documentation and the issues with automatic notification emails for Outlook calendar render that solution useless. 

But a simple "subscribe to calendar" link, is really needed, if not already available.  Businesses live and die by their integrated Calendars that are synced with all their devices (i.e. Apple Calendar, Google Calendar or Outlook Calendar).  Not having a project management tool that easily plugs into calendars seems like a MAJOR oversight. Hoping I may have missed something...