Haere mai, haere mai, haere.
Te Meri Kirihimete te O ECN.
A Whaaka Te Hae A Te Kaha.
{Translated, it means welcome you all and a very merry Christmas, also the bottom line means best wishes to your family and your ancestors}
There isn't a Maori word for ECN I'm afraid, my ancestors didn't have the Internet.
Watch out for the Tribe Ngati-TeMicrosoft though!.