(build 20080915), (build 20090826), (build 20100507), (build 20120425), 14, 14.1, 2010, 2012, MailEssentials, Microsoft, SBS 2011, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Small Business Server 2011, SR1 (build 20081024), SR1 (build 20091027), SR1 (build 20100819), SR2 (build 20090211), SR2 (build 20091106), SR2 (build 20110131), SR3 (build 20090325), SR3 (build 20091123), SR3 (build 20110613), SR4 (build 20090408), SR4 (build 20110812), SR5 (build 20120215), Windows, Windows 7, Windows Server 2008 R2

Mqac.sys– Pre Service Pack 2 Revision History for Windows 7 SP1, Windows Server 2008 R2 SP1 and Windows Small Business Server 2011 (SBS 2011)

Mqac.sys– Pre Service Pack 2 Revision History for Windows 7 SP1, Windows Server 2008 R2 SP1 and Windows Small Business Server 2011 (SBS 2011)

05-Apr-2012 – 6.1.7601.21958 – Mqac.sys – x86/x64 – http://support.microsoft.com/kb/2688203 – “0x000000D1” and “0x000000C9” Stop errors when Message Queuing moves unsent messages to a dead-letter queue in Windows 7 or in Windows Server 2008 R2