This plug-in for Microsoft Outlook will notify you immediately when a long-awaited email arrives. You just enter the key text and the add-in pops up an alert once an e-mail containing that text in the Subject, Body, or From fields comes up.
Sometimes we have lots of things to do and they all depend on a single message. We wait for it, open Outlook every minute just to see that the long-awaited email isn't there yet. The messages you are waiting for have lots of places where they may get lost: several Outlook accounts, all your Inbox folders, and the main villain - Junk mail folder... Well, not with this doohickey! Wherever the important message comes in Outlook, you can be sure you won't miss it! The alert will come over all other open programs.
All you do is enter some keyword(s) as alert text and click Enter. It can be the sender's address, message subject or some text from the message body. Now just go on with your other work, open up any other application, you'll see the alert as soon as the message arrives in your Outlook Inbox.
Please find more information here.
Important Mail Alert is independent of your standard Outlook rules. Whatever your standard Outlook rules do to the message, wherever they move it, Important Mail Alert will fish it out.
It works in Outlook with Exchange Server.
It is up to you. The tool lets you select the accounts you want to scan.