Applies to: Exchange 2010 or later
By default, block-level backup is enabled for a newly-created user-defined subclient. You must have block-level backup enabled at the subclient level before you can recover messages.
If needed, you can disable the block-level backup for Exchange databases.
Procedure
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From the CommCell Browser, expand Client Computers > client > Exchange Database.
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Right-click subclient, and then click Properties.
The Subclient Properties dialog box appears.
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Click the Advanced Options tab.
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In the Block-Level Backup Options area, clear the Optimize for message level recovery check box.
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Click OK to clear the message.
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Click OK.