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To begin, open up Windows Mail.

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Once you’re in Windows Mail, click on ‘Tools’ and then go to ‘Accounts’.
This takes you to the ‘Internet Accounts’ window.

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Typically, you’ll want to remove any old accounts before going further.
To setup a new account, click on ‘Add’.

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‘E-mail Account’ should already be chosen, so just click ‘Next’.

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It asks first for your ‘Display name’.
Whatever is typed in here will show up next to your email address when you send an email.
After you type something in, click ‘Next’.

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Now, it asks for the E-mail address. Simply type in yours in, and then click ‘Next’.

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Now it needs the server information. Incoming e-mail server type should already be ‘POP3’, this is correct.
Below, for both the Incoming and the Outgoing mail servers, you’ll want to type: mail.cass.net
Then check ‘Outgoing server requires authentication’, and click ‘Next’.

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Here it asks for the username, and it should already be in there. It’s the first part of your email address.
Below that, you need to type in your password, and check ‘Remember password’ if you’d like. Click ‘Next’.

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Almost done, go ahead and click ‘Finish’.
This takes you back to the ‘Internet Accounts’ window with the new account in place.
Windows Mail is now set up and ready to go, just hit ‘Close’ at the bottom right.