I am trying to set up a PTP backbone link. What is the maximum distance that I can archieve with MikroTik 5GHz OUTDOOR Client Package with the 30dbi parabolic antenna. Do I need to purchase a seperate router OS to act as my router box or I can use the same software from the PTP products.

How difficult or how easy is it to set up the PTP, alingnment and confoguration wise.

THX

Search the forum, e.g.:
http://www.mikrotik.com/forum/viewtopic.php?t=1542

Yup, PTP package includes routing functionality.