The full version of Office, for free, is available via the Office Portal website. You will need to access this portal using your University credentials to confirm that you are a member of staff or a student. Once you have logged in to the Portal, you will be able to download and install the latest version - including on your mobile device or tablet.
You will be prompted periodically to sign in to the Portal, in order to verify that you are still a member of the University and therefore eligible to use the software.
A guide to installing Office at home is available from the self-service portal.