OK, not sure about this because merge to HTML seems to work on some systems
(e.g. here) and not others. Merging to HTML does use a MAPI interface that
other methods do not use, but usually the problem does not pop up as an
error in the way you describe.

It could be something to do with the way MAPI (and in particularl the MAPI
DLLs have been installed. Maybe you could check the date & version of
MAPI32.DLL in your SYSTEM32 folder (e.g. in c:\Windows\system32). For
example, mine is dated 31 Mar 2003, version 1.0.2536.0 . Could you also see
if there is a file in there called MAPISTUB.DLL ?

Not sure this is going to get us anywhere but it's probably worth checking
this stuff.

Peter Jamieson