Hi, I'm James Robert, Working as a Database Engineer at Cigati Solution, a Data Migration Expert Company. Recently we have created a tool that helps many outlook users fix errors like Outlook Sending Duplicate Emails, Outlook Inbox Not Showing All Emails, and Outlook Not Receiving Emails.
Read: https://www.cigatisolutions.com/blog/fix-outlook-for-mac-not-syncing-with-exchange-server-error/