Here is how I discovered this.  I get a mail with a Windooz virus in it.  My virus scan alerts me.

Next in outlook I delete the message.  Empty the Outlook rubbish bin. Quit outlook.  

I now happen to do a scan for viruses (we have a very slow Mac here, and just to make sure...) and the infected file is found again in: Users/user/Documents/Microsoft User Data/Office Identities/username/Data Records/Message Sources/0T/0B/0M/0K/x255_666.alk14MsgSource

Why does it not delete it?  

So I thought maybe a restart helps?  Nope stil there.  This way I discoverd files that where nuked ± a year ago.  Why does it not delete these?  And what is more how to delete them as this uses up the storage and only the lord knows what is stil all hanging around in there.

Any tips?  Or is this an other piece of 'brilliant' programming we need to live with?  

Thanks.