Email And Outlook

Ever since I had a OS reload, all the mail in Horde will show up as "read" after I use Outlook to fetch them. (Exaim is installed, Outlook is using POP3 to connect) Even mail that have never been opened in Outlook will show up as "read". Before this, the mail in Horde was never synchronized with Outlook. For example, if I read a piece of mail, it won't show up as read in Horde. Instead, it'll show up as "unread" until I read it using Horde. Now, it the mail in Horde seems to be synchronized with Outlook though Outlok keeps a copy on server even after deleting it locally (on the PC).

I don't want that to happen because my other co-admin uses Horde and I use Outlook.

It'll mess up the read/unread settings for each. I never changed any settings in Outlook so it must be some config on the server. Anyone have a clue where to change this setting so this behavior doesn't occur?