Isn't it cool?
The Windows Desktop Search Add-in for Lotus Notes is a protocol handler that allows you to index the content of Lotus Notes e-mail, contacts, calendar items, and journal items stored on your computer.
Once you have installed this Add-in, Windows Desktop Search (WDS) will index the content of your locally stored Lotus Notes databases. Indexing will occur when your PC is idle, or when you tell WDS to ‘Index Now’. Once the index is updated you can immediately search your Lotus Notes content.
Download it from here... Microsoft Download Site
Baware though, it caused problems for me, I was continuously getting these.
Error: 'Windows cannot find 'Notes:///8525666600461713' occurs when attempting to open bookmarks in Notes
When users click local bookmarks on the left sidebar in Notes® 8 Standard Configuration, an error message displays indicating an operating system error and that "Windows cannot find" the file. This does not occur when using Notes 8 Basic Configuration.
Solution: Uninstall the plug-in and install it with latest version of Windows Search.