The Steps Followed to Get the Excel Connector working are as below:
[1] Installed Office Toolkit from the below Site: http://www.salesforce.com/us/developer/docs/officetoolkit30/SForce_Office_Toolkit_MSI.zip
[2] Downloaded the Excel Connector XLA from the below URL http://excel-connector.googlecode.com/files/sforce_connector_901.zip.
[3] Excel >> Excel Options >> Add - Ins >> Manage (Excel Add - Ins) >> Browse >> Located the sforce_connect file (XLA file)
I was able to establish the Connection with my Sandbox by following the Steps...
In the Salesforce.com Login dialog Keyed in the below: User Name: Sandbox User Name Password: Password+Security Token Server URL: https://test.salesforce.com/services/Soap/c/16.0
And was able to connect....
I still have one issues while querying Custom Objects ....
Whenever a Query is initiated on a Custom Object, the criterion [System Modstamp > 1/26/2013] gets automatically added and the below error is thrown ... I also get a popup stating No Records returned.
Microsoft Excel
Error Generated by request::An internal server error has occured while processing your request. Url:https://cs8-api.salesforce.com/services/Soap/c/16.0/00DL00000002wGB ExceptionCode : 5103
OK
Is there a solution to address the Error? ....