Receiving duplicate emails from years ago
Emails are coming in to email accounts around the world that are exact duplicates of emails received months, or even years ago.
There is one significant difference from the original: a virus-infected Microsoft Office file is attached.
Someone has managed to get access to email archives from multiple email providers, and is using these to send incredibly legitimate-looking emails to users, to distribute their virus.
This virus is currently poorly detected by antivirus software; as of this writing, 31/60 on virustotal.com.
Until more is known about this virus, it's best to avoid opening any Microsoft Office file attachments received by email.