Outlook users who have already been tricked by the phishing email messages are asked to change their passwords immediately, before their accounts are hijacked and used fraudulently by cybercriminals.
The "How to Block Junk, Spam and Unwanted mail in Outlook.com" Phishing Scam
From: Outlook 2017 Supportemail@example.com
Sent: Friday, January 20, 2017 7:53 AM
Subject: How to Block Junk, Spam and Unwanted mail in Outlook.com
This message is from a trusted sender.
Please verify that you read the email. Click above.
We have noticed an unusual amount of spam and login attempts to your account firstname.lastname@example.org. Please fix your spam filter or let us fix it for you. If you are worried about the login attempts, please reply by Yes or No. Your safety is our concern.
Would you like to obtain The Microsoft Office Outlook Junk Email Filter 4.3.5? For Outlook 2016 and Outlook 2017, the junk email filters updates are located on the Microsoft Download Center Please reply to this email by Yes, so we can install The Outlook Junk Email Filter 4.3.5 on your mailbox. If you are not willing to have this new system, please reply to this email by No.
Hotmail Security Center,
Also, Microsoft will never send email messages to their users asking them to respond to indicate that they want an upgrade or not. Important notifications or upgrades are always displayed to Outlook users once they have signed into their accounts.