"A soil sample was cooked twice in one of Phoenix's eight ovens over the last few days, according to William Boynton, The first test reached 95 degrees, the second 350 degrees.
"Had there been any ice, it would have melted," Boynton said. "We saw no water in the soil whatsoever."
"It looks like we clipped the edge of the top of a polygon," said Ray Arvidson, the lead scientist for the lander's robotic arm."
The polygonal land forms -- small mounds bounded by shallow trenches -- are similar to features that scientists have seen in the Arctic on Earth caused by subsurface ice."
Any relation to other polygonal observences in the solar system?
"This could be the tip of the iceberg," Arvidson said."
Of course if it were, then they would have found water

Perhaps just a posative attitude.
Hope they find Something worth the $$ invested.