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PST, Move Mailbox, and Single Instance Storage

adramis asked
Medium Priority
Last Modified: 2012-05-06
I import a PST into an Exchange 2003 mailbox and break Single Instance Storage for those messages. Later, if I move this mailbox to an Exchange 2007 server, will SIS for these messages re-establish at all?
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No this will not re-establish the SIS .

Read following ( this applies to E2K7 as well)


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tigermattSite Reliability Engineer
Most Valuable Expert 2011

In general once the SIS is broken it is gone for ever. Moving the mailbox between servers  will not re-establish SIS, since it was broken prior to the mailbox move.

SIS will only remain when mailboxes are moved if it was present beforehand; this way, Exchange can simply migrate the SIS 'links' across.

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