[ExchangeList] Re: 2003 SP2 to 2003 SP2 user mailbox size grew

Single instance storage is per store (database).  You can't really "lose" it.  
Exchange will never keep more than one copy of a message in the database.  i.e. 
 You move a user from store A to store B.  He has a message from another user 
on store B in his inbox.  When the mailbox is being moved, exchange checks all 
messages coming in during the move process and realizes that the message in the 
inbox on user A, is already in the sent items folder of user B.  Therefore, it 
doesn't store it again, it just puts a pointer to the message.

The only time file sizes really grow, is when you move 5 users from store A, 
all with the same message, to 5 different stores.  Then the message has to be 
copied 5 times to the new stores.  Any subsequent users who get moved to those 
stores with the same message, will get pointers, provided the message still 
exists.  i.e. once the user has emptied his deleted items folder, the message 
is no longer in the store, so any subsequent moves will copy it in again.

Greg



  ----- Original Message ----- 
  From: Danny 
  To: exchangelist@xxxxxxxxxxxxx 
  Sent: Wednesday, February 21, 2007 3:18 PM
  Subject: [ExchangeList] Re: 2003 SP2 to 2003 SP2 user mailbox size grew


  Do you happen to have any Microsoft documentation that confirms this?

  I found this KB, which stirs up more questions: 
http://support.microsoft.com/kb/175481

  Thanks,

  ...D

   
  On 2/20/07, Periyasamy, Raj <Raj.Periyasamy@xxxxxxxxxxxx> wrote: 
    The moment you move your mailbox from one store to another, you lose the 
SSI, not just Exmerge.



    Regards,

    R 

    From: exchangelist-bounce@xxxxxxxxxxxxx 
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Danny
    Sent: Monday, February 19, 2007 11:59 AM 
    To: exchangelist@xxxxxxxxxxxxx
    Subject: [ExchangeList] Re: 2003 SP2 to 2003 SP2 user mailbox size grew 



    No Exmerg'ing going on here - I am aware of the single instance storage 
loss. 

    2003 SP2 to 2003 SP2, same org, same domain. Exchange System Manager -> 
Mailbox Store -> Exchange Tasks -> Move Mailbox. 

    Thanks,

    ...D

    On 2/19/07, Exchange Mailing List <ExchangeMailingList@xxxxxxxxxx> wrote: 

    Depends how you did it. If you exmerged, then you have lost single instance 
storage.



    S



    From: exchangelist-bounce@xxxxxxxxxxxxx [mailto: 
exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Danny
    Sent: Monday, February 19, 2007 12:23 PM 
    To: exchangelist@xxxxxxxxxxxxx
    Subject: [ExchangeList] 2003 SP2 to 2003 SP2 user mailbox size grew 



    Moved mailboxes to a new server. Confirming this is normal and by how much 
should they grow?

    Thanks,

    ...D




    -- 
    CPDE - Certified Petroleum Distribution Engineer
    CCBC - Certified Canadian Beer Consumer 




  -- 
  CPDE - Certified Petroleum Distribution Engineer 
  CCBC - Certified Canadian Beer Consumer

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