As a test I just downloaded one of those images and I was not prevented from doing so, nor was I offered any words or such, (as in Terms, Copyright or similar), that suggested I was violating any copyright law.
I think you will be fine and Microsoft are offering these images freely.
However, you could if you wish add a line of text under each image something like, "Courtesy of Microsoft.com", or "Copyright Microsoft.com" or on similar lines. It doesn't have to be large, just small text which acknowledges where you got them from. I'm sure Microsoft would appreciate that.
Microsoft's Copyright FAQ might be interesting; http://www.microsoft.com/about/legal/en/us/Copyright/Default.aspx
I hope that helps.
I have Microsoft Office 2010 Home and Business (Retail Version) and Microsoft Publisher 2010 (Retail Version), which I use in the publication of a church magazine (circulation: around 300) that is distributed free of charge and carries no paid for advertising. In short it is not for profit.
I would like to download images from the Microsoft website for use in the magazine.
Am I free to do so without violating copyright?
The website to which I refer is as follows: