If you have a computer running Windows Vista connected to a Lan , a Domain or a Workgroup, you are unable to activate Windows Vista by phone.

On a Windows Vista-based computer, you use Private Branch Exchange (PBX) software that uses Telephony API (TAPI) to manage telephone calls from clients. However, telephone numbers from the clients are truncated. Therefore, PBX software obtains only half of the telephone number of a call. This problem may affect some features of the PBX software.

On a Windows Vista-based computer, you try to connect to a network by using a dial-up connection in Windows Internet Explorer 7. However, you may receive an error message that resembles the following:

Cannot write to the telephone book.
Error 624 : Telephone book file cannot be updated.

The dial-up connection attempt is unsuccessful.