This tickbox field on the Contacts module works in conjunction with the sync options available with our integration with Microsoft 365, Googlesync, and the Outlook Add-In

Outlook Add-In

If a record does not have the "Sync to Outlook" box ticked, this will contact will automatically be excluded when using the Outlook Add-In.

Googlesync / Microsoft 365

On each User settings, you have the option to ignore/ override this tickbox

More information about the Outlook Add-In: can be found here.

See Also: this FAQ

More information regarding Googlesync: is also available.