Yes, they bought $150,000,000 in NON-VOTING shares. M$ also settled out-of-court with Apple the whole ripping-off-Mac-OS lawsuit thingy, once and for all, with an undisclosed $UM of dough. As part of the deal, M$ was obligated to keep the stocks for five years (which ended in May of 2002, I believe).
As part of the deal, IE/Mac was blessed as the default browser in Mac OS installs, some technology sharing was pledged between Apple and MS, and MS promised five more years of Office/Mac. Now, you should know that -- according to Microsoft's own figures -- MS makes about $300,000,000 A YEAR off of Office/Mac sales. So, that can't be bad in their books.
Although $150,000,000 sounds like a lot, keep in mind that, at that time (before Jobs took over as interim CEO), Apple was losing anYwhere between THIRTY AND SIXTY MILLION DOLLARS A QUARTER!!! the way things were, Apple would have bled that dough out of their books inside of a year. So really, that stock purchase was nothing in context to the overall financial shape of Apple. What saved Apple was Steve jobs coming in there, trimming and refocusing the product line, killing the clone agreements (and the Newton ) and getting that little saviour the iMac out to market. the rest, as they say, is history.