Windows 2008 server - Thousands of logon/logoff in audit log.

I am reviewing the audit log on one of my '08 servers and am simply amazed at the massive number of events orruring.  Using the logonID, I am able to match loon and logoff events on a single machine loging on and off several time each minute.  Multiply that by 30 or so machines on this network, and the Audit Event log is will over 300K records.  Is this normal or is this poining to a network issue?  BTW, the server in question is an AD controller, with file sharing, and running Exchange 2007.

Thanks
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tcampbell_ncAsked:
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Wayne88Commented:
What are the event IDs?  Are they 4624 and 4634?

Have a look at this: https://social.technet.microsoft.com/Forums/windowsserver/en-US/a9370291-0520-484d-a6c3-9a23cdf94023/excessive-4624-and-4634-events?forum=winserverDS

"The event 4624 identifies the account that requested the logon - NOT the user who just logged on."

"In our case, Outlook ended up being the culprit.  I still don't know why it's authenticating so often, but we tracked it down to the individual program. "

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tcampbell_ncAuthor Commented:
Thanks for the link. Your response informed me of two things.

1. My server/domain is not broken: This appears to be one of those issues with MS servers that MS does not feel the need to address.

2. Outlook: You are correct.  Outlook / access to mail accounts seems to be causing much of this.  This sort of makes sense to me.  The outlook client will check every few minutes/seconds to see if there is new mail (when directly connected to the exchange server).  It appears that each time outlook checks, it generates a new connection, then kills the connection after checking.  Add all the smartphones connecting via activesync, and this might start explaining the abundance of events.  

Thanks for the prompt reply.
Wayne88Commented:
I am glad to be able to help. Cheers!
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Windows Server 2008

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