sendobject

I have a workorder database ( access 97)
where I try to send e-mail responses
with a command button when the work is done.
I use this in the event procedure command button
----------
Dim stinfo As String

stinfo = "Your work order no. " +
Me![W O Number] + " has been done"

DoCmd.SendObject acSendNoObject, , acFormatTXT, Me![email], , , "Confirmation
of Work Order", stinfo, True
------------
where Me![W O Number] and Me![email] are
varables from the access form.

This works on a windows 95 machine but not on a windows 98 or XP machine.
The error message is 2046, command or action sendobject isn't available now.
From this I would thank it is a machine config issue ruther than a program problem;
but I do not know what.
Thanks for you help.

Steve