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  • Blog Post: Why doesn't my Exchange Client Extension load on Windows Vista

    We had several cases lately where customers are asking this very question. The answer is basically User Account Control (UAC) . If a user is using Vista with UAC enabled Outlook is running with medium Integrity Level (IL). When a process runs with medium IL it cannot delete registry keys from the HKEY_LOCAL_MACHINE...
  • Blog Post: MAPI Forms don't launch when dowloaded from the Exchange Org Form Lib on Windows Vista

    After working this issue for just about six months I am finally at the stage where I can blog about this. Windows Vista changed the COM Activation model to prevent activiation of COM components registered in HKEY_CURRENT_USER when the COM client is running with elevated privileges. When a MAPI Form is...
  • Blog Post: VSTO 2005 Addin does not load in Outlook 2003 if UAC is disabled

    Windows Vista changes the COM Activation model and will no longer create components registered in HKEY_CURRENT_USER (HKCU) if the client application is running with a Integrity Level (IL) of higher than medium. So when UAC is disabled, Outlook will run with High IL. By default, the setup project for...
  • Blog Post: MSPST and Session 0 Isolation don't mix

    I had a case recently where a customer was using the Microsoft Personal Storage Provider (MSPST) in a service. Everything was working fine until they moved to Windows Vista, the kernel objects MSPST uses (mutants, file mappings, etc) to allow two processes to synchronize access to the same physical ...
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