Also worth noting on the AOL/Time Warner comparisons everyone is making: Everyone knew dial-up was on the way out in 2000, they just assumed AOL would 'figure it out' because they were the current market leader. Not clear to me (other than maybe metaverse, controversially) what MSFT's looming problem they need to 'figure out' is.
There's obvious optics to draining the cash balance, but it's not a problem per se, because worst case, they just return it to shareholders and Net Income/EV should be unaffected.
Conversely, what's wrong with McKesson, if their revenue is $250bn and growing, but their market cap is $40bn?
Even with their recent 11-12% correction their PE is ~33.5. [0] That’s higher than today’s S and P PE, and more than double the long term median (~15) and mean (~16) PE. [1]
This means that the market is betting on some combination of margin expansion and outsize revenue growth.
McKesson is in another industry with different margin and growth, and is valued differently.