Was Google Calendar hacked?

UPDATE: YES, THIS IS A HACK. If you get this email, ignore it.

Is anyone here using Google Calendar? I just got a note saying they were going to delete my account unless I provide them with some verifying information. But it wasn't just an email. It was actually placed there on my calendar. If this is a hack, it means they hacked into either just my account or all of Google Calendar.The update note on the calendar:

Dear Account User This Email is from Gmail Customer Care and we are sending it to every Gmail Email User Accounts Owner for safety. we are having congestions due to the anonymous registration of Gmail accounts so we are shutting down some Hotmail accounts and your account was among those to be deleted. We are sending you this email to so that you can verify and let us know if you still want to use this account. If you are still interested please confirm your account by filling the space below.Your User name,password,date of birth and your country information would be needed to verify your account.

Due to the congestion in all Gmail users and removal of all unused Gmail Accounts, Gmail would be shutting down all unused Accounts, You will have to confirm your E-mail by filling out your Login Information below after clicking the reply button, or your account will be suspended within 24 hours for security reasons.

* Username:
* Password:
* Date of Birth:
* Country Or Territory:

After following the instructions in the sheet, your account will not be interrupted and will continue as normal. Thanks for your attention to this request. We apologize for any inconveniences. Warning!!! Account owner that refuses to update his/her account after two weeks of receiving this warning will lose his or her account permanently.

The thing is I don't have a Hotmail account. I'm sure this is a sophisticated phishing hack. It's just startling that it's sitting there on my calendar. I don't know how to email Google.