Neomail,Horde,Squirel :CONFUSION [moved]

You can use the below steps to configure your Outlook Express for a particular email account :-
1. On the Tools menu, click Accounts
2. Select the Mail tab, click Add, and then click Mail.
3. In the Display name text box, type your name (e.g. info), and then click Next.
4. In the E-mail address text box, type your email address
<electronic-id>@yourdomainname(e.g. isaigi@yourdomainname), and then click Next
5. In the list of Internet mail server types, select POP3.
6. In the Incoming mail server text box, type the name of the POP3 server i.e.,
ServerIP or mail.yourodmainname
7. In the Outgoing mail server text box, type the name of the SMTP server i.e.,
ServerIp or mail.yourdomainname
8. Click Next.
9. In the Internet Mail Logon dialog box, enter your emailaddress as Account name, enter the password ,then click Next.
10. Click Finish.
11. On the Tools menu, click Accounts.
12. To select the Mail tab, click the e-mail account.
13 Click Properties.
14. Click the servers tab, and select My server requires authentication
15. Then Click the Advanced tab, and select Leave a copy of messages on server.
16. Click OK.

Yes, if you will login to Squirrel Mail with the same email account, you will see the same emails again. The webmail programs are "synced" with one another. You can use any to view your emails as per your convenience. You will be able to see the same emails in all the 3 for the same email account.

And to let you know, you will receive one copy of an email in your Outlook.