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.
QuickBooks
We have provided sales, installation, support, and training for QuickBooks products since 1995. As the QuickBooks Pro product line has matured, it has become a mainstream accounting product for small to medium sized businesses in industries across the spectrum. We maintain a QuickBooks ProAdvisor status and teach publicly available seminars for QuickBooks users seeking to improve their knowledge skills.