"Cannot get the function address for MAPILogon from MAPI32.dll. Please check your MAPI installation."
Nothing on the web about this one (one other person with the same problem), but a simple fix. There is a 'fixmapi.exe' in your windows\system32 directory. Run that, and MYOB starts e-mailling fine again!
tried the fixmapi.exe but im getting another error now.. "check the mapi installation" thanks anyway..