get_BodyFormat always return "PLAIN TEXT"

[vaigo]

Hello,
I developed an outlook add-in in COM/ATL Visual Studio 2005.

I used the below APIS's in Outlook 2003
get_BodyFormat
get_Body/get_HTMLBody
put_Body/put_HTMLBody.

The above things worked fine in outlook 2003.

But in outlook 2007, though in sender side the format is html, but in receiver side it always returns as Plain Text.

Please advise me, what I suppose to do.

Thanks
SAI