We also have the same problem caused in part by our policy of locking an account after 5 failed attempts. Members of staff can login fine, but then they found that they couldn’t access their Entourage (Exchange) email. Further investigation revealed that 10.5 was carrying out a further 12 authentication attempts after the successful one and these failed which put the user over the lockout policy limit. We don’t know why the extra authentication attempts fail, but it may be because of some feature of our staff domain, as yet unknown, because 10.5 doesn’t attempt the extra authentications on our student domain. We are quite stumped about this.
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