Microsoft in their infinate wisdom have decided to break the Mailslot API in the XP line and above. Mailslots were a great means of communicating between processes running under differing user accounts. Under XP these were made unreliable which renders them unusable.
In addition I have found that certain security API’s are missing on Windows Server 2003 custom builds. What is the point of developing against a fixed plaform if a custom build take away API calls?
Developer Rants 