That's what I thought too, but found several references that it needed to be 
installed prior to installing DPM 2007, although, we are running DPM and I 
don't remember installing it.
Supposedly this command installs it on 08.
start /wait ocsetup.exe SIS-Limited /quiet /norestart

There is also ocsetup SIS without the Limited option.
Not finding much info on those commands.
08R2 uses powershell to do this, but I've not had time to test any of it.

From: Michael B. Smith [mailto:[email protected]]
Sent: Wednesday, September 29, 2010 9:00 AM
To: NT System Admin Issues
Subject: RE: SIS

To the best of my knowledge (and I'd like to know if this has changed), SIS is 
only available in the specialized Windows Storage Server; not in normal Windows 
Server.

Regards,

Michael B. Smith
Consultant and Exchange MVP
http://TheEssentialExchange.com

From: Paul Hutchings [mailto:[email protected]]
Sent: Wednesday, September 29, 2010 8:52 AM
To: NT System Admin Issues
Subject: RE: SIS

Keep in mind Netapp does it at block whilst I think (could be dead wrong) 
Windows SIS does it at file level.

From: Glen Johnson [mailto:[email protected]]
Sent: 29 September 2010 13:41
To: NT System Admin Issues
Subject: SIS

Looking for thoughts and opinions on enabling this on server 08 and 08R2 for 
general file servers.
I've not done this, just thinking about doing it.
Anyone done it and what was the outcome.
Background.  I am attending a meeting for our Community College which is being 
hosted by NetApp and they are bragging about dedup and all the benefits in data 
reduction.
I don't think we can afford their system, but if I could get a reasonable 
reduction by using something we already have, I'd use it.
Also, anyone have a recommendation for a free or very low cost utl that would 
scan a drive and report on duplicate files.
I know I can google for a util and will, but would also appreciate any "words 
of wisdom from you folk".
Thanks.
Glen.

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