A: No. For two reasons.
First, because holiday cards are a great example of lawyers doing business just like everyone else. That’s why, between Thanksgiving and a week or so into the next year, nearly everyone sends holiday cards. It’s a great way not to differentiate yourself or your firm in any way. Your card just gets lost in the pile. The situation is worse with e-cards, which last only a few seconds instead of at least sitting on display for a month or two.
Second, Christmas (literally, Christ’s Mass) is a Christian holiday. Almost a quarter of Americans are not Christian, and although many who are not Christian celebrate Christmas as an American holiday, anyway, those who do not are probably sick of having Christmas shoved down their throats every December. Thanksgiving and New Year cards are inoffensive enough, but you are not fooling anyone with your happy generic holidays card that arrives right around Christmas.
Skip the winter holidays. Pick another holiday on which to send cards. Like April Fool’s Day or Presidents’ Day. Or the anniversary of the day of the first moon landing. Or your dog’s birthday. For bonus points, add birthdays to your card list, and send birthday cards, instead.
If you are going to go to the time (you are going to add a personal note, right?) and considerable expense of sending out a bunch of cards, make them memorable. No Christmas cards.