Cannot open mailbox Microsoft System Attendant

Issue:
When trying to migrate the mailboxes in Exchange, throws the below Error

Cannot open mailbox /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=MAILBOX01/cn=Microsoft System Attendant

Resolution:

Ideally it happens if there is no proper Database Home MDB mapped for Microsoft System Attendant mailbox for the server.

In the ADSIEDIT, Locate the following path,
CN=Configuration,CN=Services,CN=Microsoft Exchange,CN=,CN=Administrative Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT) ,CN=Servers,CN=,CN=Microsoft System Attendant – Home MDB

and map the correct available Database and restart IIS Server using IISREST /NOFORCE.

After service restarted, check the service health and try to move the mailboxes. Belive it will work.

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