2,880,000 shares would be worth $87 million today. However, since 2003 (after the last stock split) MSFT stock has had dividends. In total those dividends have come to $6.75 per share, adding an additional $19.44 million for a grand total of $106.44 million.
You'd be worth a billion or two yeah (I'm not sure if the google and yahoo finance charts are split-adjusted, I'll assume they are in which case, since MSFT's peak corresponded to an AAPL high tide ($25 in December 1999, up from $4 in January 1998 and would fall to $7.5 by December 2000) and the ratio was ~2:1 (both stocks have split 2:1 since so that does not need to be taken in account) he'd own 5.76 million AAPL shares worth... $2.6bn (at the current $459 price))
