My google account(s) have been driving me crazy for a while. I think I found a hint as to why:
Why am I seeing the message “Oops. A calendar already exists…” when I access Google Calendar?
If you’ve recently signed up for Google Apps with the same email address associated with your Google Calendar, you’ll be redirected to an error message page when accessing http://www.google.com/calendar
It’s not possible to have a Google Apps Account and a non-hosted Google Account both using the same email address. Don’t fret though, your non-hosted Google Calendar hasn’t disappeared forever. You’ll just need to make some changes in order to access your Google Calendar.
To gain access to your non-hosted Google Calendar, go to the Google Apps for Administrators Help Center here and follow the steps to change the email address associated with your Google Account to something not containing your domain name or an existing Google Account. Once you’ve changed the email address, you should be able to access both your Google Apps Calendar and your non-hosted Google Calendar normally.
Okay, the problem statement matches me. But I don’t understand their solution at all. They want me to change the email address of…. which of my Google Accounts? I think the trick is I’ve somehow ended up with TWO Google Accounts, but both with the same email addr username. Which one I’m logged in to at any given time is anyone’s guess. The help center links just links the top level help page, I have no idea what instructions they mean in particular.
Man, Google, you are awful sometimes.