This script may come in handy in the following scenarios:

• Initial configuration, avoid typos
• Expansion in the infrastructure with load balanced CAS
• Change in internal FQDN if you change certificate name
• When you have a total disaster on site 1 and need to fail over to a second site with a passive DAG server that holds all server roles

Please keep in mind:

• The Script is developed for Exchange 2003 coexistence and migration scenarios
• The script must not be run in an Exchange 2007 coexistence and migration scenario
• For InternalURL the script will look for a CASArray (It is recommended to create a CASArray in any scenario)
• The script assumes there is only one ADsite

About the script:

• First you will be presented with som choices on what to do
• InternalURL will autoconfigure based on CASArray
• ExternalURL will prompt for public FQDN and assume one external address
  • Will use same FQDN for OWA, ActiveSync, Autodiscover and so on
• Will prompt for Exchange 2003 URL
• All configuration will output the changes made

Update 27.05.2010:

• Added support for Exchange 2007 and Exchange 2007/2010 coexistence scenarios.
• The script will check for Exchange version before applying any settings.
• When applying Exchange 2010 Internal URL the script will match the CAS servers to the correct CASarray in the correct ADsite

Update 28.05.2010

• Added option for checking current configuration
• Corrected some errors on the Exchange 2007 configuration and listing of URLs
• Tested in Exchange 2007 only deployments and Exchange 2010 and 2007 coexistence deployments

 The Script can be viewed and downloaded here: http://msunified.net/exchange-downloads/script-internalexternalurls-ps1/