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Unable to access an account or mailbox. Error: ErrorMailboxConfiguration

Last Update: 7/21/2017 11:31 AM
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Unable to access an account or mailbox. Error: ErrorMailboxConfiguration


This error can occur when more than one account exists in the Office 365 tenant. A common scenario is when a user was put on litigation hold, deleted, and then re-created. The account on hold is in soft delete; attempting to access this user via EWS will cause this error.

For an account named, an easy way to confirm the scenario is to run to following PowerShell command:

Get-Mailbox -IncludeInactiveMailbox fail | fl Alias,IsSoftDeletedByRemove,LitigationHoldEnabled
​Alias                 ​: fail
IsSoftDeletedByRemove : True
LitigationHoldEnabled : True
Alias                 : fail
IsSoftDeletedByRemove : False
LitigationHoldEnabled : False

This shows that there is only one active user, and one soft deleted because the LitigationHold is enabled.

The only way to fix the configuration error is to remove that user. The litigation hold will have to be removed.

First, remove the litigation hold on the inactive user:

Set-Mailbox fail -InactiveMailbox -LitigationHoldEnabled $false

Confirm if there is a deleted user:

Get-MsolUser -ReturnDeletedUsers
UserPrincipalName DisplayName isLicensed
----------------- ----------- ----------   fail        False

Remove that user with the following command:

Remove-MsolUser -UserPrincipalName -RemoveFromRecycleBin
Confirm Continue with this operation?
​[Y] Yes [N] No [S] Suspend [?] Help (default is "Y"): y

Confirm if there is still an inactive Mailbox for that user:

Get-Mailbox –InactiveMailboxOnly
Name Alias ServerName ProhibitSendQuota
---- ----- ---------- -----------------
fail fail by2pr11mb0504 49.5 GB (53,150,220,288 bytes)​

If there is, it may be necessary to manually delete the Mailbox for that user:

Get-Mailbox -InactiveMailboxOnly fail | Remove-Mailbox