Hi

I have a MAPI message store which works perfectly with Outlook 2007 but not
with 2003. The problem I'm having with it is that HTML messages don't render
in OL2003. I can't find any properties which could lead to this and I have
tried a lot of properties.

The MAPI provider has a helper COM add in written in C++. I've managed to
get it working by making the COM plugin read the MAPI property PR_HTML and
setting it as the HTML body via the OOM.

This works. But as far as I can see all it does it add two MAPI properties
OutlookVersion and another OutlookVersion property (InternalOutlookVersion)
with a string property. Setting these properties manually has no effect (
with the correct GUID for MAPI named properties ).

The only other thing I can think of is that the HTML editor property in the
OOM gets set when the COM plugin sets the body via the OOM. This is NULL
otherwise ( even in OL2007 though it works in OL2007 without it ).

Also the EntryID in MAPI ( PR_ENTRYID ) is clearly visible for my messages
but in the OOM the entry ID is shown as blank. I can't imagine what would
cause this.

Could anyone shed any light on these problems?

Cheers
Win