Hi, I have Windows Server 2008 R2. I have the only server in domain. It has AD, enabled IPv6, installed MS FilterPack 2007, domain's type is WS 2008. I chose Custom type of installation and selected all items. All was good but then there was error Client Access Role Failed Error: The following error was generated when «$error.Clear(); Install-ExchangeCertificate -services «IIS, POP, IMAP» -DomainController $RoleDomainController» was run: «Could not grant Network Service access to the certificate with thumbprint C69F3206C11CF50CE986357CF3A8E00762FF2A57 because a cryptographic exception was thrown.». Could not grant Network Service access to the certificate with thumbprint C69F3206C11CF50CE986357CF3A8E00762FF2A57 because a cryptographic exception was thrown. Access is denied. Thanks.

See this similar thread: http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/c2291cca-c565-4261-82c1-1309f9065d15Tim Harrington - Catapult Systems - http://HowDoUC.blogspot.com