from what I just googled - therefore not certain - the Excalibur is not the same sword that was in the stone. Also, the sword in the stone would only be withdrawn by the true heir to the throne. So to answer the question, yes, Thor can wield Excalibur but he can not withdraw the sword in the stone.
Excalibur was given to Arthur by the Lady of the Lake I think; the sword in the stone was for the true heir as said. That said, which Excalibur are we talking about? I'm not sure if Thor could put up with Soul Eater's Excalibur. He could wield either though.
I'm not sure if Thor could put up with Soul Eater's Excalibur.FOOLS!!!!
Excalibur is commonly mixed with the sword in the stone...as if they are the same...original tellings have two different swords, the one that proves the bloodline and royal lineage....and Excalibur. Thor would likely not be able to remove the sword from the stone as it is only meant for Arthur, he could weild Excalibur though...it was just a sword...an awesome sword, but it wasn't like Mjilnor or anything
@cattlebattle: Im more of a sword/shield guy than warhammer, but when the sword's powers are: healing factor and cutting through anything and the hammer's are: Thor's god like abilities, I wouldn't think twice about picking the hammer
The scabbard endowed the healing factor...not the actual sword, thats how Arthur died, Morguase stole it and he bled to death from his wounds