MSOs are not supported in PDF. The preview panel until CS6 was misnamed and was finally changed in CS6 to the SWF Preview panel.
I think Jeff wrapped MSO to placed SWF before exporting PDF... but link to actual video resource and skin will be lost during the process.
You have two options:
a) If you don´t need a controller, you can simply place your video from URL instead of using local file. Downside is that Acrobat throws an alert to user when it tries to connect the URL of your video.
b) You can embedd the resources of video (flv) and skin file in Acrobat. Open PDF into Acrobat Professional, select Multimedia/SWF tool and doubleclick your SWF. Navigate to resources tab and add resources folder InDesign created while you exported your SWF (the one which included the actual video inside MSO) - Click OK and save your PDF.
Thank you! Your b) option worked.
I am having the same issue.
However I have acrobat XI pro and when I click the add SWF tool when I have my interactive PDF created from the embedded SWF in indesign a big white box appears, then I double click on it and I see the edit tools... I add the resources and save my file. Then when I open it again it just a big white box appears, I click to activate it and nothing happens. What am I doing wrong. Thanks for the help.