“I sold my YHOO stake, which I held through my hedge fund last month when it hit $20,” Jackson told Digital Daily. “I still own a small amount personally. I had no idea idea it would fall this much but I finally decided to stop pushing a rope by calling for change from the inside [as a shareholder]. I voted with my feet. This board has the blood of its shareholders on its hands, and I hope they wear that scarlet letter stigma for a long time.”

Asked to comment on Mithras Capital Partners proposal that Yahoo (YHOO) sell itself to Microsoft (MSFT) for $22 a share, Jackson had this to say: “If I was in Redmond, I’d say why not wait a few weeks and pick this company up for a couple of bucks?”  

“It’s hard to believe the board could let this happen,” Jackson told the Associated Press. “I think they completely misconstrued the situation and thought, ‘Microsoft is rich, so let’s soak them.’ They were bluffing all the way and got caught.”

If Jackson hopes to make good on his threat, he’d best get cracking. Shareholders have only 10 days from the announcement of Yahoo’s annual meeting to nominate directors and Yahoo did just that this past Monday. That means Jackson has until May 15 to pull his slate together. Perhaps he can just borrow Microsoft’s (MSFT) …