I have generated a report that has about 29,000 contacts that are owned by previous employees who are no longer active users. Because the contact owner is not active we can't make changes to the account name field in Salesforce. I can export this report as a .csv. How then do I use the excel connector to update the contact owners name and re-import into Salesforce?

I have generated a report that has about 29,000 contacts that are owned by previous employees who are no longer active users. Because the contact owner is not active we can't make changes to the account name field in Salesforce. I can export this report as a .csv. How then do I use the excel connector to update the contact owners name and re-import into Salesforce?