Maybe it changed more recently, but in the first couple years after acquisition they (WM and Jet) had very different approaches to things like search and there was a lot of internal conflict over whose was better. I think they pretty much just kept things separate as a result, so probably not a lot of long-term tech value attained by WM.
Then see what WalMart's ecommerce growth was before Marc Lore
and what it is now after Marc Lore
Perhaps the single biggest factor that it is growing fast is that they got the CEO/Founder of Diapers.com and Jet.com to come help them understand ecommerce
