powershell script to monitor a particular event.

Can someone please advise how to write a powershell program to send an email if a Windows 2008 R2 server has a certain event for example event ID 55.
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For you case I suggest to use "Attach a Task to this Event" and use the email option.
I used it and is working great. You can read more about this on next resources: Attaching Tasks to Event Viewer Logs and Events or Getting event log contents by email on an event log trigger.
"Attach a Task to this Event" probably the best option you have, however if you want a powershell script to perform this task then you can check the following script from script center..
Powershell Centralized Log Monitor

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