Autumn is exactly right. If you know your login information, you can check out your order history at this link: https://www.techsoup.org/stock/secure/orderhistory.asp
If you've placed orders for Microsoft products in the past two years, you will need to see whether you've ordered your maximum or not: up to 6 different titles (ie, Microsoft Office Pro 2007, Microsoft Visio, etc), and up to 50 licenses of each. If you haven't and it's been more than a year since you placed your last MS order, you should be able to place another order within those limits.
Thanks,
Becky