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keithdarl
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Exchange Storage

Hi

Can I ask the following question,
If a user sends a mail with 1Mb attachements to say 50 users within the same Exchange organisation.
Will the resulting increase in IS storage be 50Mb (ie 1Mb added for each of the 50 inboxes that received the email)?
Or
1Mb, ie does exchange store it once and have pointers to the 50 inboxes?

thanks
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keithdarl

8/22/2022 - Mon
the_endjinn

Which version of Exchange are you using?

Exchange 2003 and 2007 use single instance storage, meaning that the attachement will be stored once.

Exchange 2010 no longer uses single instancing meaning you will end up with a 50MB increase in the store. http://blogs.technet.com/b/exchange/archive/2010/02/22/3409361.aspx
the_endjinn

Also, single instancing was only ever for users within the same mailbox store (as in, per database) rather than the same Exchange org.
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the_endjinn

Not even an assist despite answering the question, providing Microsoft's statement and reasoning behind it and expanding to clarify SIS with regards to the whole exchange org :(
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keithdarl

ASKER

Thanks for your answers above, just to clarify, the threads below from the Microsoft forum provide better insight:

http://social.technet.microsoft.com/Forums/en/exchange2010/thread/e41d1146-0d00-45b5-a939-84b83db81e96

http://social.technet.microsoft.com/Forums/en/exchange2010/thread/eff4ef8c-7776-432e-ad2d-cab507c1f767

here's a quote from this one:
     ' In Exchange 2010, the store schema has changed so that all data in a mailbox have stored-in tables close to each other in the database. Actually, each mailbox has its own folder, message header, body, and its own view table. So, the concept of single instance storage no longer exists when it comes to Exchange databases. A side effect of removing SIS from Exchange was that a database was bloated by approximately 20%. Exchange PG found a solution to this by compressing the databases (more specifically message headers and text/HTML bodies). By giving each mailbox its own set of tables, most I/Os performed against a DB are now mostly sequential I/Os. '


This one has a good explanation , though it's not from Microsoft:
http://www.enowconsulting.com/ese/2010_01_01_archive.html