Greetings, I constantly get thousands of event id 680's on my Exchange 2007 server running all the roles except edge. 0xC0000064 is User name does not exist, but these are valid users. Here's a copy of the event. Logon attempt by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Logon account: User Source Workstation: exchange server Error Code: 0xC0000064 I suspect it may have to do with the authentication type? Anyone familiar with this in Exchange 2007? Thanks. Gold is for the mistress -- silver for the maid -- Copper for the craftsman cunning at his trade. "Good!" said the Baron, sitting in his hall, "But Iron -- Cold Iron -- is master of them all."

Do you have a BES server? How is the BES configured? How is Exchange configured? i.e. single server

Yes I do have a single, stand alone BES server.Gold is for the mistress -- silver for the maid -- Copper for the craftsman cunning at his trade. "Good!" said the Baron, sitting in his hall, "But Iron -- Cold Iron -- is master of them all."

Is the BES service account a member of Exchange Org Admin group? If not, add the account in the group else remove it from the group and allow AD to update and then readd the account back into the group again.

Hi Samhain, Any updates? Please check whether these users are all BES ones.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Well done Frank! That was the fix. I did not have the bes admin membership in the Exchange Org Admin group. I tip my hat to you sir. :DGold is for the mistress -- silver for the maid -- Copper for the craftsman cunning at his trade. "Good!" said the Baron, sitting in his hall, "But Iron -- Cold Iron -- is master of them all."