This morning I was attempting to share one of my Google Apps Google Calendars with my default Gmail account with full access rights however it kept changing the sharing mode from Manage Changes and Manage Sharing to See Only Free/Busy (Hide Details). At first I thought it had to do with the calendar I was sharing too already being shared back to this calendar with lower calendar event rights however after I deleted all traces of the calendar I was still running into the same issue. Turns out the issue was in the Google Apps dashboard for the Google Apps Calendar I was attempting to share to the normal Google account. Below I describe the issue in more detail and what settings need to be modified in the Google Apps dashboard to allow you to share Google Apps Calendars with full admin privileges.
Google calendar is a great way to share calendars company wide or with multiple people outside of the company you work for. I have started using Google calendar for everything and Sync between my Outlook, Blackberry, iPod Touch, and Google Calendar to make sure I always know what I am supposed to be doing. One feature Google calendar provides is the ability to make calendars public or if you host your domain on Google Apps to share the calendar with the entire domain.
For the User Providing the Secondary Calendar to Domain Users:
I discovered something really cool tonight to help organize my default Gmail account. You can use an unlimited number of aliases which in return will allow you to easily filter or organize incoming email based on numerous factors. By default Gmail will deliver any mail with your firstname.lastname@example.org to your Gmail inbox. This not only works with @gmail.com email addresses but it will also work with any domains you have hosted via Google apps.