This guide is for the Windows 8 and above program called Mail.
Before following the below step by step guide, please find the email sent to you which contains your email settings.
Step by Step Guide
In Mail, click the settings icon in the bottom left and then click Manage Accounts.
Click + Add account.
Choose Advanced setup.
Select Internet email.
Fill in your account details.
Email Address: your email address
Username: your email address
Password: your email address password (found in the email we sent you with the subject line 'Webmail / IMAP - [Your company name]')
Account name: a name to recognise your mailbox
Send your message using this name: your name as you wish it to appear on outgoing email messages
Incoming email server: zimbra.protectedservice.net
Account type: IMAP4
Outgoing (SMTP) email server: smtp.protectedservice.net
When you have entered the relevant details, click Sign in.