If you have an SVI email address, you can access this through several methods:
Web browser
In any web browser you can navigate to https://outlook.office.com and sign in with your email address and password. This is the same password you use to access other SVI resources.
Outlook desktop application & mobile app
Setting up your email address in Outlook is very straightforward - you should just have to put in your email address and password.
Instructions for PC, Mac, Android and iOS can be found here.