Exchange 2007: Setup.com /PrepareSchema failing with error Code 8245: 'Schema update failed: An attribute with the same link identifier already exists'
In Adsiedit.msc follow the below mentioned path and provide the values as defined:Schema Container -> CN= Schema ->Right Click -> New Object -> attributeschema -> Next# For 'CN=ms-Exch-Mobile-Mailbox-Policy-Link'Attribute Value:cn 'CN=ms-Exch-Mobile-Mailbox-Policy-Link'oMSyntax 127lDAPDisplayName msExchMobileMailboxPolicyLinkisSingleValued TRUEattributeSyntax 2.5.5.1attributeID 1.2.840.113556.1.4.7000.102.50668# Finish# for 'CN=ms-Exch-Mobile-Mailbox-Policy-BL'Attribute Valuecn 'CN=ms-Exch-Mobile-Mailbox-Policy-BL'oMSyntax 127lDAPDisplayName msExchMobileMailboxPolicyBLisSingleValued FALSEattributeSyntax 2.5.5.1attributeID 1.2.840.113556.1.4.7000.102.50726# Finish# After this run the Setup.com /PrepareSchema and it will complete successfully.http://support.microsoft.com/default.aspx?scid=kb;EN-US;917682Cheers....