Access outlook application

Question

Hi,

I am trying to access outlook application in my c# code..I am able to read all mails when I debug..but when I try to access the same using a Windows service,I can't able to access..I get the following error..
"Retrieving the COM class factory for component with CLSID {0006F03A-0000-0000-C000-000000000046} failed due to the following error: 80080005."...Can anyone help me with this..