Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi, Joe
Good day!
Thank you for posting to Microsoft Community. We are happy to help you.
According to your description, the issue of your concern that you've encountered an unexpected syncing error.
First of all, could you please be kindly to give an attempt for official fixing as following steps
- Right-click the Start button, and select Apps and Features on the pop-up menu.
- Select the Microsoft Office product you want to repair, and select Modify.
- Depending if your copy of Office is Click-to-run or MSI-based install, you'll see the following options to proceed with the repair. Click-to-run > In the window How would you like to repair your Office Programs, select Online Repair > Repair to make sure everything gets fixed. MSI-based > In Change your installation, select Repair and then click Continue.
- Follow the instructions on the screen to complete the repair.
Ref: Repair an Office application
In addition, please be kindly to create a new profile to see if it helps - Create an Outlook profile. ( A broken profile can lead the syncing issue.)
Please feel free to contact us if there's an update.
Sincerely,
Alex | Microsoft Community Moderator.