Exchange patch 2010 SP3 RU8 causing this error on client systems "This message could not be sent. Try sending the message again later, or contact your network administrator. Error is [0x80004005-00000000-00000000]"
Posted by Thomas Elgood, Last modified by Thomas Elgood on 09 March 2015 12:54 PM

Troubleshooting a very strange error on a client site in which a user runing Windows 8.1 and Outlook 2013 reported that her email would decided to stop sending outbound messages after several hours of use. Inbound traffic was uneffected. The user would reboot the machine and Outlook would retun to normal function for a few hours until the cycle would repeat. The machine event logs reported TLS errors, but did not give anything specfic nor did the Windows 2010 Server running Excahange Server 2010. Checked antivirus, network drivers, network traffic, Server load, switch port and physical wiring, none of these changes had any effect on the issue. During this process a few other workstations reported similar issues. Not consistantly and only a very small precentange of the entire network. Begain looking at Exchange Server updates for clues and found this report. That Exchange 2010 SP3 RU8 was removed due to a MAPI RPC layer bug. Since the issue was specific to MAPI RPC functions, OWA, IMAP and ActiveSync continued to function as expected. 

Microsoft has since pulled the patch "Exchange 2010 SP3 RU8"  and replaced it with KB2986475 which has resolve the issue. 



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