Outlook 2011 on a Mac will show that it is connected to Exchange, but it will not update any messages over WiFi.  Client is using a MacBook Air and has no way to get a hard-wired connection.

It will work on a hotspot, but not at the office or other WiFi networks (except home(?)).

Client began having issues just before Christmas 2014 when they upgraded to Yosemite.

MacBook Air (13-inch, Mid 2013)

OSX Yosemite  v. 10.10.2 (updated to 10.10.3 as of 4/24/2015, still having problem)

Outlook for Mac 2011 v. 14.4.9 (150325)

Troubleshooting steps taken:

• New router installed in office (basic Netgear, nothing fancy in setup)
• Account deleted and recreated
• New identity created
• Manually copied server settings from a working instance of Outlook to ensure correct settings
• Added OWA address and autodiscover address to hosts file
• Flushed caches using "sudo discoveryutil udnsflushcaches"
• Local network IT cannot find anything that would cause the problem (this person is not affiliated with the same company, so confidence level is medium to low)
• Computer able to get to OWA just fine
• Created my own account on the computer which worked