In Exchange Server 2010, there is no more single instance storage (SIS). To help understand why SIS is gone, let's review a brief history of Exchange.
During the development of Exchange 4.0, we had...
Updated May 12, 2020
Version 4.0
Blog Post
Man, I've been out of the Exchange world for awhile. How ironic... version 8.5 of Lotus Notes/Domino introduced in January of 2009 implemented DAOS (Domino Attachment and Object Service), which *does* keep track of one instance of an attachment across an entire server/cluster. And that includes applications as well, not just mail databases. E.g. a CRM application and Invoicing application that each have a copy of a 5MB attachment that's ALSO in 12 user's mailboxes results in... 5 MB of storage.
IT admins are seeing as much as 77% storage reduction with this feature. It's pretty easy to look like a rock star when you can avoid thousands of dollars of disk upgrades by simply installing a new version of the software... which can be done directly on top of the old version.
Richtext compression was introduced in 2007, and attachment compression back in 2003 I think?
And what is this going to do to backup windows? If upgrading to Exchange 2010 quadruples your backup window due to substantially more data being backed up... ugh.
IT admins are seeing as much as 77% storage reduction with this feature. It's pretty easy to look like a rock star when you can avoid thousands of dollars of disk upgrades by simply installing a new version of the software... which can be done directly on top of the old version.
Richtext compression was introduced in 2007, and attachment compression back in 2003 I think?
And what is this going to do to backup windows? If upgrading to Exchange 2010 quadruples your backup window due to substantially more data being backed up... ugh.