User reports that after upgrading her iPad to IOS 6, she can no longer open attachments that are over 500k in size.

I think we're on Mobility version 1.2.3.x
The mobility connector reports:
The GW connector reports:

GW server-side is GW 2012 beta/FTF SP1/SP2 (we had bugs in the SP1 code that didn't make it into the release, so we're like beta-SP2 code at this point).