:crying: Went through the instructions for granting the sql service access to the necessary components, and restarted the sql server. Still not resolved. On a positive note, the error message has now changed:

Msg 7399, Level 16, State 1, Line 1

The OLE DB provider "MSDASQL" for linked server "SHORETEL_CDR" reported an error. The provider did not give any information about the error.

Msg 7330, Level 16, State 2, Line 1

Cannot fetch a row from OLE DB provider "MSDASQL" for linked server "SHORETEL_CDR".

Wow, I can't believe how many bloody issues I'm running into to get this linked server to work... :crazy: