Hi,

I have a VB6 app that has been working for 18months. But now generates
a 429 error at the line

Set oCDO = CreateObject("MAPI.Session")

I use Outlook 2003, Windows XP, CDO 1.21

I suppose either Windows, or the Outlook server may have changed
without my knowledge.

I haven't touched the code which, as I say has been working happily.

There are some other users of my app which experience the same problem
at the same time, which I guess points to either a change in the
Outlook server config, or a Windows update that we received
concurrently. I've checked that my cdo.dll is still in place, and it
is .

Did you ensure that CDO is selected in the Outlook setup options? It is not
selected by default.
Open regedit: do you have HKEY_CLASSES_ROOT\Mapi.Session? Do you see a CLSID
subkey?
Its default value should start with {3fa7d and so on.
Search that value in HKEY_CLASSES_ROOT\CLSID\
There should be an InprocServer32 subkey with a path to cdo.dll. Does that
file exist?

--
SvenC