Fans of Exchange’s Single Instance Storage feature will be sad to know that is gone as of Exchange 2010. That’s right. Gone.
I was reminded of this fact when reading Dr. Dedupe’s latest blog post. He points back to this blog post from Microsoft in 2007 that said “Given current trends, we expect the value of single instance storage to continue to decline over time.” I couldn’t find anything official on Microsoft’s site, but I did find this forum post that quoted this article.
The word is that SIS was hurting performance too much, so they took it out. All you need to do is buy more storage for Exchange!
Or, as Dr. Dedupe pointed out, you can move your Exchange environment to NetApp where they will give you back what Microsoft took away, as their filers have free dedupe. According to Dr. Dedupe, they’ve been seeing a 30% reduction in size.