This Error code 800CCCD3 is usually caused by misconfigured system files.
So, from my experience, if you received a Windows Live Mail Error Code 800cccd3 message then there is a 95% chance that your computer has registry problems.
These Windows errors are easy to repair. By downloading and running the registry repair tool RegCure Pro, you can quickly and effectively fix this problem and prevent others from occurring.
You may try the following steps to fix Error code 800CCCD3 :
1. Click on the File tab (which is the first tab in Outlook appearing in the top left-hand corner of Outlook 2016) > Account Settings > Account Settings drop-down button > Double-click on the concerned IMAP email account > Click on the More Settings button > Click on the Advanced tab.
2. Check under Folders, if the Root folder path box is empty or filled-in.
3. If the box is empty please type the word Inbox and then click on Apply and/or OK at the bottom of the box to save the settings.
Close the Account Settings box returning to the main Outlook 2016 window. Close Outlook 2016 and restart Outlook 2016 again. Outlook 2016 may now re-sync your IMAP account completely. So allow it to complete the synchronization (it may take a few minutes or an hour or even a few hours to complete, depending upon the number of emails in your IMAP account). This is similar to the initial sync during account setup.
After fixing the registry, a quick scan with anti-malware tool will ensure that your PC has no more problems!
Support for Synchronization Error code 800CCCD3 :
If the issue ( Error 800CCCD3) persists after performing above steps,
There might be an issue with system registry settings and configuration files or temporary files.
It is strongly recommended to have check on your computer by the technical support member,
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