When my phone broke, accessing emails was difficult until a friend told me about the Optusnet webmail portal. Now I can still do work tasks from any computer until my phone is repaired. Lets see how we can access your Optus email setting account via many other popular mail clients besides Outlook such as:
Apple Mail - Follow the same IMAP setup steps as Outlook
Mozilla Thunderbird - Enter your Optus IMAP/SMTP details during account setup
Android Mail - Settings will list Add Account, choose IMAP and enter Optus credentials
Just be sure to get the correct incoming and outgoing server details from your Optus account settings page.