Similar to the problem discussed here for an older version, my Inbox is not getting email. 

http://answers.microsoft.com/en-us/mac/forum/macoffice2011-macoutlook/1414-inbox-not-showing-all-emailsdelayed-email/a38087f0-7168-41e3-b69d-d4b095e0bfcd

The messages roll right in on iPad and iPhone, and spam seems to hit the spam box just fine, but the Inbox isn't working properly.  I can hit send/receive and refresh the box by clicking on another folder and back to it.  I get the message that "All Folders are Up to Date."  But they're not. 

It appears to be just one Inbox folder for one account, and not for the multiple accounts I monitor through Outlook.  I've read other places about refreshing the cache on a particular folder but don't know how to do that. 

If I relaunch Outlook, I am virtually certain that I'll get all of the messages. 

Any ideas for this?  Thank you!