Though it is not for every email account, the error notification says 11 of 14 tasks have been completed successfully with reported error 0x800CCC0E.
Many users often receive an error “Outlook cannot synchronize subscribed folders” when connecting IMAP emails with Outlook.
But, having many folders and messages with attachments often makes Outlook slow, especially when you configure many IMAP accounts with Outlook. Users can easily configure other email accounts like IMAP, POP, Office 365, or Exchange with MS Outlook and access all their emails/messages in one place. MS Outlook is a widely used email application, and there is a reason for that.