HP announcement legitimized the MMP as a source of system supplier licensees. Fujitsu license number was large and then when Sony signed it created an expectation that their number would be as large or larger. There was dividend thrown in there which helped in furthering the share price momentum as I recall.

The air got let out of the balloon when the Sony numbers disappointed.

This is all from memory and corrections are certainly welcome but that captures gist of the run-up dynamics I think.