Outlook IMAP setting from Exchange

Trying to set up a imap account for my boss,

I get this message:
Task "synchronizing hierarchy...' reported error (0x800CCC0e): ‘ could not fetch new headers on the folder (null) for account mail.4-way.com. Error: unable to connect to server..”

i searched the internet but no luck!

Any thoughts?   outlook
Who is Participating?
Create the following registry value to force Outlook to use PLAIN authentication:
Value Type: STRING
Value Name: EnableAuthMechanisms
Value Data: PLAIN
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