Co-Existence of Exchange 2010 with Exchange 2007. EMC Error "IIS directory entry couldn't be created. The error message is Access is denied"

Problem
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After Adding your Exchange 2010 Servers into an Organisation which has any Exchange 2007 servers present. When you try and Manage the CAS Servers through the Exchange 2010 EMC you will recieve the below error

" IIS directory entry couldn't be created. The error message is Access is denied"

Solution
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Add “Exchange Trusted Subsystem" group  a member of local admin group of ALL Exchange 2007 servers in the entire organisation.

Migrate / Export Windows 2003 IAS Radius Config to Windows 2008 R2 NPS

Iasmigreader.exe (Bulit into Windows 2008 R2 and Later) a command-line tool that exports the configuration settings of IAS on a computer running Windows Server 2003 to an Ias.txt file. Ias.txt is in a format that can be imported on an NPS server running Windows Server 2008 with the netsh nps import path\ias.txt command.

1. Copy the iasmigreader.exe file from the following folder:
   • 32-bit version of Windows Server 2008 R2
     C:\Windows\winsxs\x86_microsoft-windows-n..n_service_migreader_31bf3856ad364e35_6.1.7600.16385_none_64707cf9c089e26b
   • 64-bit version of Windows Server 2008 R2
     %windir%\syswow64\
2. Paste the file in a computer that is running Windows Server 2003 together with IAS (the IAS server).
3. On the IAS server, no sooner than one minute after you change the IAS server configuration, run the iasmigreader.exe file. This creates an Ias.txt file in the %windir%\system32\ias folder. If you are running a 64-bit version of Windows Server 2003, the Ias.txt file is created in the %windir%\syswow64\ias folder.
   
   Note The exported Ias.txt file contains all shared secret information from the configuration. Therefore, make sure that the file is stored in a secure location.
4. Copy the Ias.txt file to the NPS server.
5. At the netsh prompt on the NPS server, run the netsh nps import command, and specify the ias.txt file as the parameter. For example, at a command prompt, type the following command:
   netsh nps import <path>\ias.txt