I just received what looks like an email from Apple telling me that there is some kind of billing error with my account. If you get an email like this one DELETE IT IMMEDIATELY!
So how am I so sure this is not a legitimate email from Apple? The main tell here is that there is a link in the email and the email is asking you to click that link to give them additional information. Any legitimate company that has any experience in professional email communications knows that you don't provide links to secure websites from which you are wanting financial or personal information from the person recieving the email. Instead, you direct the person to navigate to their online account themselves. If you hover over the "My Apple Login" button in the email you will see that it exposes a web link that is definitely NOT to a secure Apple website.
Please pass this along to anyone you know that may not think twice before clicking the link in an email like this. You may just save them a ton of heartache and money...
Oh, and just for the record...iCloud calendar spammers and email spammers suck!