How can I access the salesforce contract object expiration date to send out 90 day renewal reminders to my subscription clients? We are hoping to send out a renewal notice to the contact listed in the contract "Customer Signed By" field.
Sounds like a custom situation. You can sync custom objects by going to Admin > SFDC > Custom Objects. But this is usually something the SFDC Admin and Marketo admins should work on because there may be easier ways to do this.