Logon Failure on database

I am seeing lot of errors in event logs referring Logon failures with different mail boxes ( Error: 1144 , EventID:1022) ,it's seems like unknown error to me, However, I am on the process of building a new Domain Controller and maybe that could help.

please advice with a solution if it's known error to you

ModeyAsked:
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AwinishCommented:
Can you post the exact error message along with event id.

Where is the error event is occurring is it on domain controller or exchange server?
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ModeyAuthor Commented:
@ Awinish

The error on the Exchange ,

Logon Failure on database "xxxxxxxx" - Windows account NT AUTHORITY\NETWORK SERVICE; mailbox  Error: 1144 , EventID = 1022

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activitCommented:
Is it the same account...if so have u made any changes or installed a new AV package that could be causing errors...or the backup software could be the other thing to look at if it is 3rd party
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AwinishCommented:
Did you do any migration of mailbox from ex2003 to 2007 server?

It can be there is corruption in the mailboxes too,due to which these events are occuring & try to disable or disconnect & see the error is gone.
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