I’ve been using Outlook 2011 for Mac for the past week as my primary email application. It works quite well for email — except for one initial problem. When new email arrives in my Gmail account, my iPhone detects it and beeps almost immediately, but Outlook won’t recognize it for many minutes later. It was getting to be quite frustrating — until I discovered how to fix it.
Check the Use IMAP IDLE (if the server supports it) advanced preference option. This will force Outlook to see new email as soon as the message hits your mailbox. Problem solved!