See if any of these can help you (respectively Italian and Portuguese, but not hat bad through Google translate:
http://www.engistudio.it/lanalisi-forense-degli-artefatti-di-windows-live-messenger-msn/
http://www.icofcs.org/2009/ICoFCS2009-PP02.pdf
IF I get it right, the "member" table lists sent a received invitations, whilst "Simplecontacts" are the actual contacts.
jaclaz
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