Messages produced by msg.exe goes away after 2 minutes

I am desktop support for an enterprise Windows 2008 AD environment and I have been looking for a replacement for NET SEND. The msg.exe command looked promising when using the target machine's local scheduler but the message disappears after 2 minutes on the target workstation. Has anyone found a way to force the end user to acknowledge with an OK?

Thanks for your contribution,

at \\computername 24HourTime msg * /v /w "Please Call 555-8811"

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