Below is a screenshot from Zimbra Web UI.  

Preferences >> Accounts

1. Add External Account

2. Enter your Hotmail information

3. Select Pop3

4. enter your full Hotmail email address

5. Email server is pop3.live.com

6. POP port 995

7. Use SSL

8. Pick to Download to Folder

9. Select - Remove emails from server - this is needed per Hotmail is a POP server

10. Have your Hotmail account open in another window and Test Settings then Save

11. Get Emails by going to your new Hotmail folder and press