Why Apple sent me this email ?

Scam.

About Email and Other Scams

Apple always addresses you by your name or the name they have on file for you.  The Email will be from apple.com or itunes.com. Email addresses can be spoofed. You can go to Mail > View > Message > Show all Headers to see more. Apple Emails will never contain an attachment. Apple will never request personal information such as Social Security numbers.

An exception to the above is when you order something from the Apple Store. The receipt will be addressed to Dear Apple Customer.

Avoid Scams

1. Identify and report phishing emails and other suspicious messages
2. Annual Reminder- Watch out for email Phishing Scams
3. Identifying fraudulent "phishing" email
4. Beware of Browser Pop-Up Tech Support, Phishing Scams
5. Phishing & Other Suspicious Emails
6. Avoid phishing emails, fake 'virus' alerts, phony support calls, & other scams
7. Phony "tech support" - "ransomware" popups and ... | Communities

Report phishing email to abuse@apple.com.