Microsoft has released a set of documents which enumerate the Accessibility features in its major Microsoft products like Windows 7, Windows Vista, Windows XP, Microsoft Office 2010, Office 2007, Office 2003, Internet Explorer 8, IE 7 & IE 6.
Computer technology is an important and powerful tool for people with difficulties and impairments. Microsoft’s accessible technology solutions enable people of all abilities to realize their potential.
These downloads give a quick overview of the accessibility features of these products and are worth checking out!
Download Page: Accessibility features | Accessibility training documentation.
If you know of some senior citizens with any impairments, please do share this post with them. I am sure that they will thank you for the same as they will find the downloads to be of immense help! 
Just in case you have missed, Microsoft recently gave its Accessibility website a cool new look!
These links may also interest you:
5 health issues, every over 40 computer user should be aware of!
Guide from Microsoft for the Over 50 crowd.
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