I want to know the market value (market capitalization) of a company on a particular day in the recent past (within the past 5 years). How can I do this, may be with the help of Google Finance or Yahoo Finance or some other tool?
One possibility would be to use Wolfram Alpha.
If I type the search phrase
market capitalization msft 3rd December 2010 then the search engine returns the following:
If you use Wolfram Mathematica on your PC then you can import the data directly for processing using the
FinancialData command (see here).