I thought I would try the example in the MAPI extender help file to rule out my code completely. That doesn't work either. I tried my updated code on a Windows 2000/Office 2000 box and it still works. So it seems that the issue is related to the version of Outlook, although the OS is different on both machines as well. I added lines to the example to get the current directory and set up the debug trace to write to a file in that directory, but otherwiise the example is unchanged.

I get the following from the DebugTrace...

************************************************************

*** Debug Initialized ***

==============================
Thu 1/19/2006 10:34:13 AM
WinBatch 32 2005C
WIL DLL 5.7ceg
F:\Programming\Mail\BCCSpy\test.WBT
Windows platform: NT, version: 5.1, build: 2600 (Service Pack 2)
ErrorMode: @CANCEL
==============================

----- Extender loaded: C:\Program Files\WinBatch\System\wwmap34i.dll (file version: 27007,0,0,0)

AddExtender("wwmap34i.dll")
(63) VALUE INT => 1

mhdl=mlogon("")
(219) VALUE INT => 282862648

Message("DEBUG" , mhdl)
(1766) VALUE INT => 1

mailid=""
(1766) VALUE STRING => ""

While @True
(1782) WHILE==>TRUE

mailid=mFindNext(mhdl,mailid,1)
(2047) VALUE STRING => "0M`````#-]2[M2 
Message("DEBUG" , mailid)
(2766) VALUE INT => 1

if mailid=="" then break
(2782) ==>FALSE=> (skipped)

msgbody=mReadNextMsg(mhdl,mailid,1)
(5000) VALUE INT => 0

TERMINAL EXTENDER ERROR=>710 (710: MAPIReadMail failed.)

;;;END OF JOB;;;
-------------------------------------