Automatic User Lock problem in exchange 2007 environment

We have exchange 2007 server, My one of mac user having user lock problem, whenever he work on his mailbox his profile automatically goes to lock in active directory.
techgyanAsked:
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junaidITManager, ICT ServicesCommented:
why dont you trying removing the credentials used for mail from keychain and then try accessing mail again to see if it works or not. Given below is the document from microsoft on troubleshooting the account lockout issues.

http://technet.microsoft.com/en-us/library/cc773155(WS.10).aspx

not sure how much this would be of help

keep posting

and gud luck
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emadallanCommented:
this is due to that you are authenticating from a mac user which is considered as unauthenticated domain
for more info take a look here:
http://support.microsoft.com/kb/276541/en-us
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techgyanAuthor Commented:
I foreget one thing when i was reconfigured my Exchange Certificate then that problem was created.
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emadallanCommented:
are you using Microsoft Entourage 2004?
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techgyanAuthor Commented:
Yes i an using Microsoft Entourage.
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emadallanCommented:
this may be helpful:
http://support.microsoft.com/kb/887413/en-us
good luck!
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emadallanCommented:
if the previous procedures did not resolve the problem then try this:
i have read this on the net who someone said: it works!

They suggested clean install of Office X (use remove Office if you have to which is on the value pack):
Boot into safe mode (Shift at restart) and isolate the machine (i.e., no network or peripherals and stop all startup processes).
Install Office X (I also put on most of the value pack including fonts) then open each app to initiate it.
Then install the patches and again open each app.
Repair disk permissions.
Now configure Entourage manually for Exchange while in safe mode.
Runs like a dream on three machines so far. Its a pain, but it works!
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techgyanAuthor Commented:
Thanks for valuable reply
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