The attempt access messages can be filtered with the events Feature of Domino.
The list of users van be filtered out of the domino directory. On the person doc on the last tab you see what versions and machines the user uses to access the server.
Furthermore, for extracting the users’ Notes client versions, you could create 2 views (one for each of the version of Notes client), and then use a simple search criteria for each. The Note client build field is called “ClnBld”. So, your search criteria would use “contains” and then you can input the client version you want to have in that view.