You have a Voice Message
Just seen a number of these this week, an email stating there is a private voice mail message attached and to click the link.
As these are not addressed to you personally, rather to the prefix of your email address, and they are not an actual sound file, rather an HTML document, and mainly from domains such as 365messenger these are fake. Clicking the attachment will more likely than not download a small file that will redirect your browser to a website that will no doubt install some malware and infect your computer.
A quick search on Google shows this is not a new issue but has been going for a few years now.
If an email is unexpected and does not address you specifically by name, as against an email address, assume it's a spoof at best and malicious at worst. Delete it! Also, if your email program allows it, block the actual sender as well.