Topic: Duplicate email download

[Alejandro]

We upgrade our server from 5.1 to 5.6 and we have some problems with Outlook Express email client, when you enter to the webmail and see some mails, then Outlook refresh the download of mails, duplicating mails.  Each time that you enter to webmail client email agents duplicate the mail

[Terry Brummell]

Do a search, covered many, many times before!