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After you apply the cumulative update 8 in a Microsoft Exchange Server 2013 environment, you experience a large Input/Output Operations Per Second (IOPS) Write increase for FolderUpdateGroup on storage. This may cause delays in email delivery to the mailbox database. 


This is a known issue for FolderUpdateGroup.


To work around this issue, disable indexing for the mailbox database by running the Set-MailboxDatabase "Mailbox Database" -IndexEnabled $false cmdlet.


To fix this issue, install Cumulative Update 11 or a later cumulative update for Exchange Server 2013.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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