Cannot open your default e-mail folders. Microsoft Exchange is not available. Ether there are network problems or the exchange Computer is down for maintenance

Issue: -

Cannot open your default e-mail folder" error when users try to open their mailboxes in Outlook after migration from Exchange 2003 to Exchange 2010

Error Message: -

When you trying to open Mailbox in outlook either 2007/2010, It will through “Cannot open your default e-mail folders. Microsoft Exchange is not available. Ether there are network problems or the exchange Computer is down for maintenance”.

Error Statement: -

When mailbox migrated from Exchange 2003 to Exchange 2010 some attributes are getting duplicated with other mailboxes. This will happen when you have replication problem or Active Directory unhealthy.

Resolution: -

To find the duplicate proxy address in active directory, Please follow the below steps

1.           Log on to the Client Access server (CAS) to which the users are connected, and then locate the following folder that stores the log file: 

C:\Program Files\Microsoft\Exchange Server\V14\Logging\RPC Client Access

2.           You can find the user logon server by using below command

Get-logonstatistics –Identity “User Email address”

3.           Open the RCA-YYYYMMDD-X.log file, and then search events that are related to the users in question. For example, you find the following information:

/O=Learnexchange/OU=First Administrative Group/cn=Recipients/cn=Gengaiyan' ,,,12.0.6315.5000,,170.12.8.90,fe80::78dd:fc1:9cb8:2e72%11,ncacn_ip_tcp,Connect,0,,,RpcDispatch: Unable to map userDn '/O=Learnexchange/OU=First Administrative Group/cn=Recipients/cn=Gengaiyan' to exchangePrincipal (StoreError=UnknownUser)

4.            '/O=Learnexchange/OU=First Administrative Group/cn=Recipients/cn=Gengaiyan' ,,,12.0.6315.5000,,170.12.8.90,fe80::78dd:fc1:9cb8:2e72%11,ncacn_ip_tcp,Connect,0,,,RpcDispatch: Unable to map userDn '/O=Learnexchange/OU=First Administrative Group/cn=Recipients/cn=Gengaiyan' to exchangePrincipal (StoreError=UnknownUser)

5.           Copy the LegacyexchangeDn information of the user. For example, copy the following:

/O=Learnexchange/OU=First Administrative Group/cn=Recipients/cn=Gengaiyan

6.           In Active Directory Users and Computer (ADUC), right-click the domain object, and then click Find.

Click the list next to Find, and then select Custom search.

Click Advanced, type the following Lightweight Directory Access Protocol (LDAP) statement under Enter LDAP query, and then click Find Now:

(proxyaddresses=X500:/O=Learnexchange/OU=First Administrative Group/cn=Recipients/cn=Gengaiyan)C

Determine whether any duplicate users are returned.

7.           Check the X500 address of any returned users, and then remove the duplicate proxy address for those users.

After removed the duplicate proxy address still user not able to access the mailbox in outlook and sometime OWA as well.

But some other scenario it will not work please follow the below process Your account has been disabled error message when you try to sign in to Outlook Web App

Thanks..

Keep Visit...