[mariotre]

I don't know if I should continue on this thread or start up a new thread but I have a similar problem using Outlook 2007 Beta.

It keeps displaying the user/password window when I use Microsoft Outlook and I verified most of the obvious reasons:

The username/password prompt can come up due to several reasons:
1. Username or Password is wrong
2. You haven't configured Outlook properly for the relevant account.

<<< I checked that and I'm sure this is not the issue >>>

a) Your server is configured to accept SSL connections only and you are not connecting using SSL
b) Vice versa
c) The MTA Global settings are set in a way that you will not be authenticated.

<<< 2a/b. I checked that and I'm sure this is not the issue >>>
<<< I'm not using SSL and zimbra is not configured to use SSL >>>
<<< Not sure about 2c. How can I check that? >>>

What settings have you used to connect to your POP server?

In Outlook:
Require Logon using Secure Password Authentication (SPA) is not set.
Outgoing Server:
My outgoing server (SMTP) requires authentication is checked
--- use same settings as my incoming mail server is checked
Log on to incoming server before sending mail : not checked

Advanced:
Incoming server (POP3) port : 110
--- This server requires an encrypted connection (SSL) : Not checked
Outgoing server (SMTP) port : 25
--- Not encrypted connection