They don't need to read it, but outlook needs to be open to process it. In
my experience, it can take up to 2 min for outlook to process the recall.
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http://forums.slipstick.com/showthread.php?t=39473
"Brian Tillman [MVP-Outlook]" <tillman1952@yahoo.com> wrote in message
news:e6XYXt7vKHA.5812@TK2MSFTNGP02.phx.gbl...
> "Wendy" <Wendy@discussions.microsoft.com> wrote in message
> news:CAEDD9BA-8457-4D98-B0E6-CC903DBD3EB0@microsoft.com...
>
>> Can anyone tell me if I can perform a message recall and have all the
>> messages automatically deleted from the recipients machine without them
>> even
>> knowing about it in the first place?
>
> And on top if what the others have said, if the person doesn't read the
> recall notice first, it won't remove the recalled message.
> --
> Brian Tillman [MVP-Outlook]