Exchange 2010 management tools do not start after the installation of .NET hotfix KB 2449742

Please see the following KB article for the resolution of this problem:

http://support.microsoft.com/kb/2540222

Source : http://blogs.technet.com/b/exchange/archive/2011/04/15/exchange-2010-management-tools-do-not-start-after-the-installation-of-net-hotfix-kb-2449742.aspx

We have become aware of a problem that impacts Exchange management tools on servers running Exchange 2010 on Windows Server 2008 SP2.

Note: Windows 2008 R2 SP1 systems do not seem to be impacted. Windows 2008 R2 RTM is impacted.

The symptoms of the problem are:

• Exchange Management Shell does not start
• Exchange Management Console does not start
• There might be a crash in Exchange Mailbox Replication Service (it is not clear yet if this is related)
• Event Viewer might have trouble opening

The following events could be logged in the Application event log:

• Event ID: 1023
  Source: .NET Runtime
  Event ID: 1023
  Level: Error
  Description: .NET Runtime version 2.0.50727.5653 - Fatal Execution Engine Error (000007FEF9216D36) (80131506)
• Event ID: 1000
  Source: Application Error
  Level: Error
  Description: Faulting application PowerShell.exe, version 6.0.6002.18111, time stamp 0x4acfacc6, faulting module mscorwks.dll, version 2.0.50727.5653, time stamp 0x4d54a59c, exception code 0xc0000005, fault offset 0x00000000001d9e19, process id 0x%9, application start time 0x%10.