On 20/03/15 00:48, Daniel Jitnah wrote:
> Outlook 2007 will not login to the new server for POP user that were
> on the old server. But new users wil same Pop (and smtp setting) will
> login no problem and have full email functionality. Login (userame
> and password) using old server account details work on new server as
> expected after transferring.

This sounds to me like an authentication method problem.

The two main authentication methods are LOGIN and PLAIN, but Dovecot only 
enables PLAIN by default.  Outlook, however, remembers the last mechanism that 
worked and always tries to use that in future.

Also you may be attempting to use POP without SSL, (*) which Dovecot also 
hinders.

In my case I needed to add the following to /etc/dovecot/local.cf during a 
similar migration to what you described:

  disable_plaintext_auth = no
  auth_mechanisms = plain login

(*) Don't EVER do this.  Just because I maintain systems where this is a 
requirement doesn't mean I think it is a good idea.
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