Recipients of the same message who have already followed the instructions in it should change their email account's password immediately before their accounts are hijacked and used fraudulently.
The "Microsoft Mailbox Storage Full" Phishing Scam
From: Microsoft account team [email@example.com]
Sent: Wednesday, March 14, 2018 12:39 PM
Subject: Re: Storage Full
Mailbox Storage Full
We sent this message to notify you that your mailbox storage is full
Starting from today 3/14/2018 your messages would fail to deliver until you visit below to increase your storage!
Microsoft account team
One Microsoft Way.
Redmond, WA 98052, USA.
The link in the fake email message goes to a fake Microsoft Outlook, Hotmail or Live website. On the fake website, visitors will be asked to sign-in, if they attempt to do so, their email usernames and passwords will be sent to the cybercriminals responsible for the phishing email message. Once the cybercriminals have gotten their potential victims Microsoft account credentials, they will gain access to their accounts, hijack the accounts by changing passwords, and use the accounts fraudulently.
Remember, always go directly to your Microsoft mailbox by going to www.hotmail.com, www.outlook.com or, www.live.com verify if your mailbox is full, instead of clicking on a link in an email message. And, for those users whose accounts have already been hijacked, they can click here for help recovering their accounts.