I recently received an error message that Outlook (MAC 2011) needed to "rebuild". I followed the online instructions and completed the process as instructed; however, after completion, I was unable to receive any new messages. I am able to reply to previously received messages, but I need to determine why I cannot receive new messages. The mail system on my MAC and the web-based mail system from my ISP provider both show new messages, so I know that the problem is occurring only in Outlook. Please help.