Uncheck the top-level email account (shown in red below).

Expand Search Folders, right-click Unread Mail (if you've created your Unread Mail search folder), and choose, Customize This Search Folder.

Access your folder list within Outlook by clicking on the three dots in the bottom left of your Outlook application.Please follow these steps listed if you do not want to see these synchronization log messages in your 'Unread Mail' search folder. How to Remove Synchronization Log Messages? Removing Synchronization Log Messages from Unread Mail search folder: Click the link here to follow the steps listed in the section 'How to Remove Synchronization Log Messages from the Unread Mail search folder?'. Now, if you have created an Unread Mail search folder in Outlook, you may begin seeing synchronization log messages in that search folder like the one below ( For more information on the search folders, visit the following article from Microsoft: Use Search Folders to find messages or other Outlook items).

For more information on where to find this sync issues folder and details of these folders, click here. Microsoft Outlook contains synchronization issues folders which include logs and items that Microsoft Outlook has been unable to synchronize with your email servers. Having messages in these folders is a normal function of Outlook as they are error checking mechanisms that the program uses to sync your email to email services.

Could not synchronize record exchange