Nepomuk/Semantic messages

Hi,

When I started KMail this morning, a message appeared

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                                  Semantic Data Storage

Nepomuk Semantic Desktop needs the Virtuoso RDF server to store its data. 
Installing the Virtuoso Soprano plugin is mandatory for using Nepomuk.
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Then when I go to start a new mail, or replt to a mail, a small coloured box 
appears at the top of the composed email (at start), it says ..

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You do not have the semantic desktop system enabled. The following features 
will not work correctly:
Recipient auto-completion
Distribution lists
Per-contact crypto preferences
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and there is a configure button ??
Peter

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