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 Exchange 2007 Service Pack 1 introduces several changes in the Extensible Storage Engine (ESE). In my first blog article on the subject, I discussed the removal of page dependencies and the disabling of partial merges. In this blog, I discuss other changes we made to ESE which enhance Exchange.   - Passive Node I/O improvements  
 - Online Defragmentation  
 - Checksumming databases  
 - Page Zeroing
   
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