First off......Merry Christmas to all you fellow Tradgangers! May your hearts and souls be filled with joy!
Second.....for you folks that may not be aware (RC and SSWV - I'll pick you out since you chose to add the negative comments on this otherwise good post of Svein's) of the not only the "intent" of Xmas or the actual usage, I'll provide a bit of a history lesson:
Xmas has been used for hundreds of years in religious writing, where the X represents a Greek "chi", the first letter of Χριστος (Kristos), "Christ." In this use it is parallel to other forms like Xtian, "Christian." But people unaware of the Greek origin of this X often mistakenly interpret Xmas as an informal shortening, pronounced (ĕks'məs). Many therefore frown upon the term Xmas because it appears to them a mere commercial convenience or a slighting of their interpretation when one omits Christ from Christmas.