Issues that the cumulative update resolves
Cumulative Update 3 for Microsoft Exchange Server 2013 contains the fix for the security issue that is described in Security Bulletin MS13-061 and resolves the issues that are described in the following Microsoft Knowledge Base (KB) articles:-
2865161 "Errors: Failed exporting item id: from source id" when you try to copy search results in an Exchange Server 2013 environment
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2866064 Can't load OWA Premium by using Internet Explorer 11 in an Exchange Server environment
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2871980 Child domains are not displayed for selection when you create a mailbox by using EAC in an Exchange Server 2013 environment
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2874216 Security issue that is described in Security Bulletin MS13-061 is resolved by an Exchange Server update
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2878160 "The Active Directory user wasn't found" error when you create or update an In-Place eDiscovery search in an Exchange Server 2013 environment
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2882608 Exchange Server 2013 does not share the inproxy.dll file
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2886115 Retention policies are not applied to Exchange Server 2013 mailboxes when user accounts are on different domains
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2888274 WebClientReadFormQueryString string and WebClientEditFormQueryString string return incorrect URLs in an Exchange Server 2013 environment
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2888315 Event 2112 or 2180 is logged when you try to back up a database in an Exchange Server 2013 environment
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2888612 Retention policy does not work after you run a cmdlet in an Exchange Server 2013 environment
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2889786 Sign-in format for Outlook Web App on mobile devices is not adjusted according to the Set-OwaVirtualDerictory cmdlet in an Exchange Server 2013 environment
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2890650 Items in the Drafts folder are not stamped with the retention policy tag in an Exchange Server 2010 or 2013 environment
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2895487 "Copy Search Results" option does not work in an Exchange server 2013 environment
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2895500 DBCS characters appear garbled when you run some PowerShell scripts in EMS in an Exchange Server 2013 environment
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2895678 "Nombre de usuario\dominio" is displayed unexpectedly on the Spanish version of the OWA and EAC logon pages in an Exchange Server 2013 environment
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2902929 You cannot forward an external meeting request in an Exchange Server 2013 environment
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2902929 You cannot forward an external meeting request in an Exchange Server 2013 environment
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2902933 "Generate incident report" does not display the "Bcc" field in an Exchange Server 2013 environment
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2902934 Korean language localization issue in Exchange 2013 OWA user interface
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2902936 You cannot change SMTP addresses for distribution groups by using EAC in an Exchange Server 2013 environment
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2902938 You cannot preview Office documents in shared folders by using Outlook Web App in an Exchange Server 2013 environment
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2902939 EMS connection error when you separately install an Exchange Server 2013 Mailbox server and a Client Access server
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2883203 Exchange Server 2013 restarts frequently after Cumulative Update 2 is installed
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2890814 No redirection to the Outlook Web App URL for Exchange Online users in an Exchange hybrid deployment
More information can be found here; download CU3 here. As always please read comments section here prior to install.