I don't use Outlook, so I am not sure of the answer. If one does a search for "can't receive mail& outlook", you get a lot of hits. Some are for Outlook, others for Outlook Express.
I don't know if it makes a difference. I have this link which suggests that attachments
may be involved. Is all mail inaccessible, or only HTML mail, or attachments?
I suggest sending a test message in plain text, beside looking at other links.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:188.8.131.52) Gecko/20060508 Seacondor Firefox/184.108.40.206
A minority may be right, and a majority is always wrong
~ Henrik Ibsen
WinXP, SP3, 512 MB, SM2.17.1, FF21, TB17.O.5, IE8.0, Google Chrome 26, Ghostwall , Kingsoft5.6, JRE1.7_21.