Bug in Exchange 2003 ? -- Cannot set "http://schemas.microsoft.com/exchange/smallicon" property

[George Wang]

I want to change the OWA icon of a message, according to MSKB Q307638,
I should set "http://schemas.microsoft.com/exchange/smallicon"
property value to something like "/exchweb/img/myicon.gif".

But it seems this property cannot be changed: I tried with MAPI and
WebDAV, both returned S_OK, but when I check the property, it's not
there.

For MAPI, I used GetIDsFromNames() with MAPI_CREATE flag got the
property ids of following named props, no problem. Then I set the
values of these properties. SetProps() and SaveChanges() also returned
S_OK. However, when I used MDBVU32 to check the result, only
content-class property was set.

GUID: {00020386-0000-0000-C000-000000000046}
Kind: MNID_STRING
ID: content-class

GUID: {00020329-0000-0000-C000-000000000046}
Kind: MNID_STRING
ID: http://schemas.microsoft.com/exchange/smallicon

From WebDAV (using Exchange Explorer), I can set content class, but
not http://schemas.microsoft.com/exchange/smallicon. It seems its
value is always "http://server/exchweb/img/icon-msg-read.gif"

Have anyone succeeded in setting
http://schemas.microsoft.com/exchange/smallicon? Thanks.

============
P.S., the same thing works with Exchange 2000, but not Exchange 2003
RC1