NOVELL 4.11 TO 6.5 OR MS 20003 SERVER

GOING TO UPGRADE FROM NOVELL 4.11 TO NOVELL 6.5 OR MICROSOFT 2003 SERVER. I don’t know what to do in this case? REASONS ARE: WE WANT TO BE ABLE TO VPN TO MAIN OFFICE AND USE OUR RESOURCES FROM ANYWHERE. (PC’S, PRINTERS, ETC.). WE ALSO HAVE A SMALL BRANCH OFFICE AND WILL LIKE TO CONNECT BOTH OF THEM OR AT LEAST VPN BETWEEN THE TWO. THERE IS ALSO AN OPTION FOR EVERYBODY TO SHARE E-MAIL CONTACT LIST. WE ARE ALSO GETTING A NEW SERVER.
ANY HELP THANK YOU