>Also can we view past threads on mm.net in UT as I dont have Premium Membership ?

For UT related topics, you may post in Chatter/UT related topics.

As for this one, there are various options to retrieve previous threads. The most popular is the Calendar. Simply click on the Calendar from the top toolbar, select your month and the MM category. Then, at the bottom, click on the link to get all messages from the month.