When running the Exchange Pre-Deployment Analyzer I got the following message:
Exchange Development Kit (EDK) connector 'Connector for Captaris RightFax (WSPER14)' was found in the organization. Exchange Server 2010 does not support EDK connectors. This connector will need to remain on existing Exchange 2003 servers.
What are Exchange Development Kit (EDK) Connectors?
EDK connectors are third-party applications built to connect to communication systems such as fax machines, Short Message Service (SMS), telex, or to connect to other messaging systems, such as Lotus Notes, that use a gateway connector. Non-Microsoft vendors use the Exchange Development Kit (EDK) to develop proprietary connectors.