No, unfortunately, Now Up-to-Date can only send meeting notices to other users that are connected to the same event server.

When Now X is released, one of the reminder options for any event will be an email reminder that you can send out. Because the server is not finished yet, I can't say what notification options will be on meetings yet, but even the client will be able to send these email reminders in Now X.
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Sean Boiarski
Product Manager, Now Software