You can find info about it here: http://www.msexchange.org/tutorials/Exchange-Dial-tone-Restore-Method-Pa rt1.html Mark Fugatt Dedicated Supportability Engineer (Exchange) Microsoft Services Organisation Microsoft Limited Building 1, Floor 2, Zone F Microsoft Campus Thames Valley Business Park Reading RG6 1WG markfu@xxxxxxxxxxxxx http://www.microsoft.com/uk/ MSN Messenger: markfu@xxxxxxxxxxxxxxxxx Work: +44(0)118 909 5630 Mobile: +44(0)7966 8581087