MAPIInitialize fails under 64bit Windows 7 & Outlook 2010



Under Windows 7(64bit) & Outlook 2010(64bit), I call MAPIInitialize to
initialize MAPI, but there will always be a popup message saying
"Either there is no default mail client or the current mail client
cannot fulfill the messaging request.Please run Microsoft Outlook and
set it as the default mail client.", then MAPIInitialize will return
0x80004005, indicating fail to initialize MAPI.

The same program works under Windows Vista(32bit) & Outlook

What is the problem? Thanks.


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