[Dovecot] IMAP and Outlook XP Contacts

I was wondering, does Dovecot's IMAP server hand Outlook XP's contact lists? I tried to enter a contact on my IMAP server and received an error from Outlook stating that the Contacts formatting was too complex and thus couldn't be saved.

I went ahead and swung my box over to MailDir and scrapped Sendmail for Postfix [for maildir support], I was wondering, would this issue continue? In other words, by swinging over to MailDir, would Dovecot be able to handle Outlook's Contacts information? Will L G