What happens in Constant Contact when a mapped Salesforce field is updated?
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Does this sound familiar?
If you change the account owner (or any specified field) for a Contact in Salesforce, will the sync catch the Salesforce account owner change and also change that field in Constant Contact during the sync?
Yes! Absolutely, if you have mapped account owner or any specified fields to one of the 1-15 allowed fields in Constant Contact then if this field changes in CRM on the subsequent sync the field in Constant Contact will be changed to the new CRM value.
See Reference here on how to manage your Custom Fields in Constant Contact.