If you have trouble getting Windows Desktop Search to index Outlook public folders and you get a nice warning saying "To index Outlook public folder favorites, you must be running Outlook 2003 in cached mode." you should do just that. Switch to cached mode, that is.
But checking your Exchange Servers account option "Use Cached Exchanged Mode" is not enough. You also have to check "Download Public Folder Favorites".
Now I only have to figure out how to make Thunderbird/Mozzila/Eudora add-in to work. I can see Thunderbird in options and it's checked for indexing, but the results never include my Thunderbird mail messages.