According to this email, which claims to be from Skype, you have missed messages waiting. The email invites you to click a link to view your messages.
However, the email is not from Skype. The link opens a spam pharmaceutical website. These spam sites sell potentially dangerous and illegal products and they certainly should not be trusted with your credit card details.
If you receive one of these emails, just hit delete.
You have missed messages.
The Skype Team.