======Configuring iCal on Mac OSX to connect to VPOP3's CalDAV service======
This requires VPOP3 v6 or later. The following instructions are for Mac OS X v10.7.5 but should work with similar versions.

We have **not** been able to create an account by going to System Preferences -> Mail, Contacts and Calendars -> Add Account. That option simply comes up with errors that you can't get past.

Unfortunately, although Apple often do a good job with usability, this is a case where it falls down if Mac OSX doesn't recognise the server in use, and things become a lot harder than if they had just asked you to enter the details manually in the first place.

So, to add a CalDAV account, open the iCal program, and go to **iCal -> Preferences -> Accounts**. Press the + button at the bottom left of that page.

In the **Add an Account** page that opens, choose **CalDAV** from the **Account Type** box. In the **User Name** and **Password** boxes enter the VPOP3 username and password, and in the **Server Address** box enter the address of the VPOP3 computer - eg **192.168.1.1**

Press **Create**. You will probably get some errors, possibly about being unable to verify the identity of the server or not being able to detect settings. Press **Continue** as necessary. 

This setting method will allow you to continue to the actual account configuration. The **Account Settings** page will probably be completed with the details you entered previously, but check them just in case.

Press the **Create** button. You may get another warning about **Server with Secure Communication Unavailable**. Press **Continue** again (to prevent this warning you can configure an SSL certificate in VPOP3, if you have VPOP3 Enterprise). If you get taken back to the **Account Settings** page, press **Create** again. 

You should, hopefully, eventually end up at a page called **Calendar Server Options**.
====Calendar Server Options====
On this page you can now enter the details which iCal could have asked for in the first place.

  * **Account Template** - leave this as **None**
  * **User Name** - this should be completed with your VPOP3 user name, but check it
  * **Password** - this should be completed with your VPOP3 password
  * **Server Address** - this should be completed with the address of your VPOP3 server, but check it
  * **Server Path** - enter **/calendar/<username>/default/** (eg "/calendar/fred/default/")
  * **Port** - enter 5108 if you are using the default VPOP3 port for Webmail
  * **Use SSL** - leave this unchecked unless you have installed an SSL certificate and configured VPOP3's Webmail to use it (VPOP3 Enterprise only)
  * **Use Kerberos v5 for authentication** - leave this unchecked

Press the **Create** button

Hopefully this should now succeed, and if you click on the **Calendars** button in iCal, you should see your available calendars listed there.

====Known Issues====
Changes with the authentication system in VPOP3 v6.3 may cause issues with initial authentication with iCal. This should be fixed in v6.4