If you’re set up to sync your Outlook contacts, events, and tasks to Salesforce using the Sync All Outlook Items option in Salesforce for Outlook, you can still control which items you don’t want to sync.
|This feature available to manage from: both Salesforce Classic and Lightning Experience|
|Available in: All Editions|
In Outlook, select the contacts, events, and tasks you want to prevent from syncing.
On the Outlook ribbon, click Categorize.
Select the category Don’t Sync with Salesforce.
The items you categorized will stop syncing after the next sync cycle.