Forum Discussion
What_Lies_Bene1
Oct 11, 2012Cirrostratus
A few Google's suggest this is either an Outlook or AV software issue;
http://www.zimbra.com/forums/users/43094-solved-outlook-2007-account-setup.html
http://answers.microsoft.com/en-us/office/forum/office_2010-outlook/in-outlook-2010-i-receive-error-report-0x800ccc1a/74f2a191-69db-4ad2-8a48-a73fd2250d85
As the first article suggests, switching to IMAP (whether it solves this issue or not, although I think it will) is probably your best course of action for many reasons.