The quickest way of accessing your @cam.ac.uk email is through the Microsoft Webmail page. You can use this from any web browser.
On the College MCS computers, just type 'hermes' in the username box and press return. Note that if you use this option, you won't be able to browse the internet or edit documents, but if all you want to do is read email this gets you logged in much quicker than logging on to your MCS account.
If you would rather set up an email application on your device such as Outlook, Apple Mail, Thunderbird, Android Mail etc, configuration instructions from the University Information Services for email applications are here.