TROUBLESHOOT ACCOUNT LOCKED OUT ON ACTIVE DIRECTORY

1. If the user accessing email (MS Exchange) using smart phone/ipad, please make sure user configure using the right username & password. 
2. Services - verify and check if this user has registered her account on the services.
3. Clear save password - In Windows Vista, 7 and 8 you can check your WINDOWS VAULT (similar to the Mac Keychain) using the CREDENTIAL MANAGER which can be found in the Control Panel.
4. Clear virus – Conficker, Downadup and others will try to make network connections over and over again and will lock your account.  You can try a free safety scan on this URL  https://www.microsoft.com/en-us/security/pc-security/malware-removal.aspx.

For further troubleshooting we can use Account Locked Out tools and refer to the article below:
https://www.microsoft.com/en-us/download/details.aspx?id=15201
http://social.technet.microsoft.com/wiki/contents/articles/4585.account-locked-out-troubleshooting-eventcombmt.aspx
http://social.technet.microsoft.com/wiki/contents/articles/15997.using-url-rewrite-to-block-certain-clients-from-exchange.aspx

Exchange Active Sync Related
http://blogs.technet.com/b/messaging_with_communications/archive/2012/06/26/activesync-disabled-accounts-and-devices-continuing-to-sync.aspx
http://blogs.technet.com/b/messaging_with_communications/archive/2012/06/27/part-ii-outlook-amp-owa-disabled-accounts-and-users-still-being-able-to-access.aspx

FORCE MOVE ACTIVE MAILBOX WHEN THE ACTIVE MAILBOX FAILED

We found this problem happen on the Microsoft Exchange 2010 Mailbox server. Suddenly, one of the member of DAG (Exch01 server) with Active mailbox is down, because the storage issue. So the user request to move the Active mailboxes to another DAG member (Exch02 server), based on checking before the problem happen the replication status is healthy. So we decided to move active mailboxes by using the command as below;

move-activemailboxdatabase -identity  mailbox_db1  -activateonserver Exch02 -mountdialoverride:none -skip activationchecks -skiplagchecks -skipclientExperiencechecks