DNS Aging & Scavenging

I've got an SBS 2008 server, we've had a lot of computers come and go from the network in it's few years alive.
We got a bung of 10009 errors and they are all due to duplicate entries in DNS from old machines matching new machines. So I started manually removing the old ones.
Then I found Aging & Scavenging... should I be using this? Can someone explain pro's / cons for this...?

Thanks in advance.
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Yes you should be using this and remeber to enable it on two(!) different places, this article  might help a lot: http://technet.microsoft.com/en-us/library/cc771362%28v=ws.10%29.aspx

To understand it, try reading this: http://technet.microsoft.com/en-us/library/cc771677.aspx

Remeber to set scavenging on the server and on the zone!

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optimus_nzAuthor Commented:
That's a perfect answer - thanks heaps.
What periods do you suggest for the settings?
Personally I set them to 7 days.
optimus_nzAuthor Commented:
Great - I have updated. If a machine doesn't check in for 7 days, and the DNS deletes it's record, i'm assuming it'll simply dynamically update DNS as soon as it rejoins the network?
Yes - unless you have changed the default settings regarding dynamic updates etc.
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Windows Server 2008

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