Looking on the internet deeply has found these results:

season's greetings is the most popular phrase on the web.

seasons greetings 1735,000 results on the web	season's greetings 16,570,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Don't you mean season's greetings? Office of the Council, thank you to the President of the Commission, season's greetings to us all and above all our best wishes for the adoption of the Treaty in 2008 by the other 26 countries. Greetings and good wishes from President Roosevelt has sent us to the occasion of the Holy season of Christmas were for us source of rejoicing. Thank you to the President, thank you to the President Can the Commission inform me whose idea it was to distribute OLAF desktop calendars, OLAF table calendars and OLAF season's greeting cards to all Commission staff and external relations staff? Well, season's greetings to you. in	Don't you mean season's greetings? Thank you to the President, thank you to the President Well, season's greetings to you. in Office of the Council, thank you to the President of the Commission, season's greetings to us all and above all our best wishes for the adoption of the Treaty in 2008 by the other 26 countries.

seasons greetings

1735,000 results on the web

season's greetings

16,570,000 results on the web

More popular!

Don't you mean season's greetings?
Office of the Council, thank you to the President of the Commission, season's greetings to us all and above all our best wishes for the adoption of the Treaty in 2008 by the other 26 countries.
Greetings and good wishes from President Roosevelt has sent us to the occasion of the Holy season of Christmas were for us source of rejoicing.
Thank you to the President, thank you to the President
Can the Commission inform me whose idea it was to distribute OLAF desktop calendars, OLAF table calendars and OLAF season's greeting cards to all Commission staff and external relations staff?
Well, season's greetings to you.
in

Don't you mean season's greetings?
Thank you to the President, thank you to the President
Well, season's greetings to you.
in
Office of the Council, thank you to the President of the Commission, season's greetings to us all and above all our best wishes for the adoption of the Treaty in 2008 by the other 26 countries.