I have a Mac Book Pro, OSX Lion, Office for Mac 2011.
When the MBP is connected through ethernet send/receive email works fine.
When the MBP is connected to a WIFI (inside or outside of our domain) send/receive email works fine.
When MBP is connected through Verizon USB Modem (4G LTE) then Outlook says "Connecting..." and send/receive doesn't work, can still get to the internet it just won't send/receive email.
Hoping someone here has a solution or some ideas to try...