An easy way to determine legitimacy of an unexpected email is to reply (without opening the inbound message) and ask the sender whether they intended to send you the message and/or attachment.
Microsoft

With experience dating back to our inception, we offer sales, installation, support, and training for Windows XP, Windows 7, Windows 8.x, and Office (Access, Excel, Outlook, PowerPoint, Publisher, Visio, and Word) versions 2003 through 2013. This is another product area in which we offer tailored, client-site and classroom training.