The Autotask-Salesforce Extension
This extension is no longer available for new implementations. The Customer Relationship Management integration from AxeRoy: Autotask++Salesforce ConnectPack may provide the features you need. Refer to Autotask/Salesforce AxeRoy ConnectPack.
Legacy Salesforce Extension users can find the Autotask Help information in this PDF: Autotask Salesforce Extension, legacy documentation.