!! Please note: This only applies to CTI Versions 5.30 and below !! !! Since Microsoft has changed the EULA of their WIF SDK we are now allowed to include all required files into our setups !!
All of our client products (Telephone Integration and DocumentsCorePack Client) need the WindowsIdentityFoundation Framework to be able to connect to CRM 2011.
Unfortunately the WIF Framework is not officially supported on WindowsXP by Microsoft, but there are 2 ways to make this work on a WindowsXP OS.