I just enabled Calendar for our Google Apps account. I have been using a Google Calendar account, tied to my gmail address. Since I only check mail though the Google Apps interface, I wanted to move all of my calendars to the Google Apps domain.
I found a pretty easy way to do this:
- In the gmail account, share each calendar with the email address that you want to use, with "Make changes AND manage sharing" permission.
- Now in the account in Google Apps, delete the share with the gmail account. (This is not strictly necessary, but I didn't want to leave these calendars in the gmail account.)
Unfortunately, you have to manually subscribe to all of the "Other Calendars" that are in the gmail account.