Notes 5.0.1 and workstation restrictions did not work well. Notes didn't handle not having admin rights to your machine very well until much later versions of Notes, along the lines of 5.0.9a. If possible, get the Notes installation up to 5.0.13 or later. . .preferably some release of 6.5. Remember that Notes 6.5 is not supported on NT Workstation.
I'm surprised that the recommendation is to install 5.0.13 client. This will not handle 'mailto' links on Web pages -- it crashes the client.
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