[MSDN Library April 2000] IID (17.9166666666667%)

MSDN Library - April 2000 > Platform SDK > Messaging and Collaboration Services > Messaging API (MAPI) > Reference > MAPI Structures

[MSDN Library April 2000] IID (15%)

MSDN Library - April 2000 > Platform SDK > Component Services > COM > COM Fundamentals > Reference > Registry Entries > Interface Key

[MSDN Library April 2000] /iid (2.01288244766506%)

MSDN Library - April 2000 > Platform SDK > Component Services > COM > Microsoft Interface Definition Language (MIDL) > MIDL Command-Line Reference