Installing RU1 for Exchange 2010

When Installing RU1 for Exchange 2010  you might get Error 1603 in event viewer and the installation ends with no apparent reason All you have to do is Install the RU from an elevated Power Shell.

Also if you experience  long time in “Creating native images for .NET assemblies”  you have 2 choices either to Expose the Exchange server to the internet to allow it to download CRL files or disable this option in IE :

Tools \ Internet Options \ Security \ Check for Publishers Certificate Revocation

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