In Microsoft Outlook, you can use rules to automatically move emails with a "SYNCED" category to another folder. Here's how:
Open Outlook Rules Settings:
In Outlook, go to the File tab.
Select Manage Rules & Alerts.
Create a New Rule:
Click New Rule.
Under Start from a blank rule, select Apply rule on messages I receive and click Next.
Set the Condition:
Check the box for assigned to a category.
Click on category, and in the dialog that opens, select SYNCED (or the category you want to use). Click OK, then Next.
Define the Action:
Check the box for move it to the specified folder.
Click specified, choose the Done folder (or create a new one), and click OK.
Review and Activate:
Give the rule a name, like Move SYNCED Emails to Done.
Ensure the rule is checked to activate it and click Finish.