Have you checked out Lotus on Red Hat?
http://www.lotusonredhat.com/
There is a trial version Live dvd of IBM/Red Hat Lotus Notes referenced here:
http://www.redhat.com/partners/partn.../live_dvd.html
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The lack of a good desktop search integrated with lotus notes is a serious impediment to taking linux up in my workplace.
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Red Hat Enterprise Linux isn't free, and I don't know the extent to which Lotus Notes is integrated, but it might be worth looking into. There might also be possibilities in CentOS, which is a debranded Red Hat without the support.
Edit: What about Google Desktop - apparently it will index anything, including Lotus Notes.