Denisse Attig
Denisse Attig voted up Walt O'Reagun's answer

I tell them "Merry Christmas" if I see them, and know they celebrate Christmas.  Otherwise, I tell them "Happy Holidays" due to the various holidays at the same time.

I used to mail cards ... Until I found everybody was either discarding them without opening, or reusing them. 

>> How do you reuse a Christmas card?  … Read more