Fix: Open XML SDK hang in multithreaded environments

Just come to know through my colleague about this fix- wanted to share.
We finally have a fix for this long standing issue where applications using Open XML SDK (or System.IO.Packaging) would hang in multithreaded scenarios while working with large files.(10MB limit related bug).

Hotfix rollup 2996566 for the .NET Framework 4.5, 4.5.1, and 4.5.2 on Windows 8.1 and Windows Server 2012 R2
http://support.microsoft.com/kb/2996566
Hotfix rollup 2996567 for the .NET Framework 4.5, 4.5.1, and 4.5.2 on Windows 8 and Windows Server 2012
http://support.microsoft.com/kb/2996567
Hotfix rollup 2996568 for the .NET Framework 4.5, 4.5.1, and 4.5.2 on Vista SP2, Windows Server 2008 SP2, Windows 7 SP1, and Windows Server 2008 R2 SP1
http://support.microsoft.com/kb/2996568

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