Boeing.
Don't they recommend for the 737 landing with a crab in winds of about 20kts or more with more than 15 degrees of flaps?
From the Boeing 747 Flight Crew Training Manual:
"It is not necessary to eliminate the crosswind crab angle prior to touchdown on wet runways. Allowing the airplane to touch down without removing the crab angle will reduce drift toward the downwind side of the runway".
And as you can see by this vid, you can land perfectly well in a crab. And some aircraft, especially those with very low nacelles (737) or engines that are far outboard (747) will sometimes require you to land in a crab.
Crosswinds - Video