Microsoft Outlook won't connect to Exchange Server

I was troubleshooting an issue where the Outlook client wouldn't connect to Exchange Server. It wasn't a ping issue (I could ping the server) and it wasn't domain resolution. I also could view the one user's Outlook Web Access Account. It simply wouldn't connect Outlook to Exchange, either hanging on profile creation, or giving an error on connect.

To fix this, I went to c:\documents and settings\username\local settings\application data\microsoft\outlook and added a new folder "old" and moved the stuff in outlook folder to "old" and tried again. This apparently cleaned itself up.

This Operation Can't Be Performed Outlook Web Access

This operation can't be performed:
Can't add a calendar item in Outlook web access. For one person. He has exceeded his send/recieve quota and therefore can't add via OWA because it's an email via OWA.