First, you must be registered at FreeGroups.net's front web page. You can do this by going there now to register, or by sending any email message to firstname.lastname@example.org. Once you get your initial logon information by email, you need to visit freegroups.net's front page and log in once, to set your final password. Once you have that information, you can proceed with these next steps.
In MS Outlook, pick Tools -> Accounts...
then create a new news entry for associate.com and enter your MimerDesk Account name and password in the Properties as shown in the second dialog below.
This will cause Outlook to "log in" to the news server at associate.com so you can read all the email archives for groups you are subscribed to.