Is it possible to set the LDAP attribute for office phones, so as to allow the Exchange to connect only with phones with this attribute? Anyone tried this solution? As a result I am looking for a solution in which the user even knowing the server, username and password will not be able to connect to the e-mail from "foreign" phones.

You can allow only Provisioned Windows Mobile Devices to Connect to your Network.. below is the URL which can help you to do that .. http://blogs.technet.com/b/vik/archive/2007/02/27/how-to-allow-only-provisioned-windows-mobile-devices-to-connect-to-your-network.aspx Apart from this HOW TO: Use ADSI to Set LDAP Directory Attributes http://support.microsoft.com/kb/260251/vi-v Thanks

hi, You can try to use the solution like amit79 say. Set the LDAP attribute i don't think can help you. hope can help you thanks,CastinLu TechNet Community Support