One of the great feature of Microsoft Enterprise Search - crawling a Notes Database through MOSS. Though the protocol handler is installed by default with the MOSS installation it is not enabled by default. To enable the crawler to work read the great article posted at:

Additional reading:

 

Additionally if you want to configure Lotus crawling (Email, Contacts, Calendar, Journal etc) you need to install Lotus Notes Add-in for WDS (Windows Desktop Search) from here.

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