Hello Rubert Mumps
Welcome to the Microsoft Community.
According to the /Outlook for Windows/ category you posted, we know your problem is "Using Outlook to sync inbox mail encountered error code 0x800CCC0E ". Please feel free to correct me if my understanding is wrong.
In short, assuming no previous changes have been made, this should be a security protocol update specific to the domain name of your email account. The password for your IMAP account does not match the authentication of the IMAP server. At this point, you should try to create a New app-specific password, and then update your account password.
You have to log into your mailbox's domain website and (under your account security settings) have it generate a random password for a third-party application (like Outlook) to log into your account. For this error code you can refer to the following two threads:thread one / thread two
If you don't know where your application-specific password should be generated, we recommend that you contact the official support of the ISP service provider of your email account to provide it for you.
Hope it helps! If any update, welcome to share with us.
Best regards,
Chandy|Microsoft Community Support Specialist
* Beware of scammers posting fake support numbers here.