Hi sbowman,
May be:

Sub DefaultMailSoftware()
Const Key As String = "HKLM\Software\Clients\Mail\"
MsgBox CreateObject("WScript.Shell").regread(Key), 64
End Sub

MP

"sbowman" a écrit dans le message de news:
...
I need a way to determine if my users are using Lotus or Outlook via
VBA code. I'm sending out an email after all processing is done and I
expected that all users were on Lotus, but now I've found out some are
using outlook....BOOOOOOO!!!

Thanks,
Shelley