Desktop Outlook 2013 not receiving new emails

Critical user can no longer receive emails to desktop Outlook 2013.  Sending works just fine. 

Send/receive status is hung indefinitely on task to receive.

Steps taken to resolve:

1. Create new profile
2. Turned off cache mode (this works but is not a solution - user must be able to work offline)
3. Send/receive by groups (user@domain only, Inbox, etc.)  All attempts hang

We have many users that travel frequently and require a local download of all sent/received emails.  Please advise w/ resolution.