I tried to create a SharePoint site for contact records with CON as a site name, i.e. http://[server]/sites/CON. A site returned "An unexpected error has occurred." After contacting Microsoft product support service team, I found out that it is a product issue -- You can call it a bug or a feature by design.


This is a response from Microsoft product support service:
"MS-DOS device names are reserved words and cannot be used as folder or file names. When parsing a reference to a file or folder, Windows checks for the case in which a single MS-DOS device name is used in the path, and treats it as invalid."


The support team also provided this KB article - http://support.microsoft.com/kb/71843.


The following words are reserved in MS-DOS. You will not be able to use the following words as a sub site name or folder name:

CON, COM1 - COM4, PRN, AUX, LPT1