Exchange 2013 mailbox restore fails cannot open mailbox microsoft system attendant

I am having problems when trying to restore a mailbox.
I get an error:
Cannot open mailbox /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=MBXsvr/cn=Microsoft System Attendant
This is the first time I have tried restoring mailbox on this 2013 Server. This 2013 server is from a recent 2010 migration.
I also recently lost Discovery Search mailbox and had to recreate it.
I found an article on 2010 that says to set the homeMDB, but I am not sure if that is needed in 2013. There is none set in this AD.

Hi,
I searched and found that someone got the same error and resolved it by repairing the recovery database.
Please repair your recovery database to check result.
Instead of using the production space, try moving the RDB over to a test environment and running the New-MailboxRepairRequest there, then move it back
to the production environment. To repair recovery database, you can follow steps below.
1. Spin up a test environment.
○ Create a test-production DB in the test environment.
○ Dismount the DB in the test environment and rename it
to old (or just delete it if it has no data that needs
to be kept).
2. Bring over the recovery DB to the test environment.
○ Rename it to match the test-production DB and put it in the test-productionDB location.
○ Mount the RDB in the test environment (as if it were the test-productionDB)
○ Run the New-MailboxRepairRequest to repair the affected mailbox
○ Once complete, dismount the recoveryDB.
3. Bring the recovery DB back to the production environment.
○ Rename it to it's original name and put it back in it's original location.
○ Mount the RDB in it's original (rdb) location with it's original RDB name.
○ Run the New-MailboxRestoreRequest to merge the affected mailbox back into the production space.
Hope this is helpful to you.
Best regards,
If you have feedback for TechNet Subscriber Support, contact
[email protected]
Belinda Ma
TechNet Community Support

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Exchange 2013 "Could not open mailbox Microsoft System Attendant" room mailbox

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This topic first appeared in the Spiceworks Community

Rock07,
I find a related link for your reference:
Event ID 12014 – Microsoft Exchange could not find a certificate
http://msexchangeguru.com/2011/06/22/event12014/
Disclaimer:
Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure
that you completely understand the risk before retrieving any suggestions from the above link.
More details:
1. Run this cmdlet in Exchange management shell and copy the THUMBPRINT to a notepad:
Get-ExchangeCertificate |FL
2. Get-ExchangeCertificate -Thumbprint “A4530629717651BE6C4443FAC376F23412184CF3″ | New-ExchangeCertificate
Click Yes when prompted
3. Run Get-ExchangeCertificate |FL to get both new and old certificate Thumbprint.
4. Enable-ExchangeCertificate -Thumbprint 3A25CDB554EF6DDF81D32C2D54873DSF7FE54F71 -Services SMTP
Remember that this THUMBPRINT is the one for the new Certificate which we just created
and we are enabling it for SMTP
5. To remove old certificate, run Remove-ExchangeCertificate -Thumbprint A4530629717651BE6C4443FAC376F23412184CF3
Thanks
Mavis Huang
TechNet Community Support

Cannot open mailbox system attendand- randomly

Hello,
our environment have Exchange 2013 with CU7 installed, and lately receive weird problem that is not persistent but it unexplained.
All databases mounted that are in DAG, all arbitration mailboxes good, in ADSIEDIT checked homeMDB, and it is not set, however, i dont know is this relevant because sometimes is failing, sometimes is success.
When we run user creation we randomly get error:
Cannot open mailbox /o=ORGANIZATION/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=SERVER/cn=Microsoft System Attendant. CategoryInfo: NotSpecified: (:) [Set-MailboxRegionalConfiguration],
MailboxUnavailableException, FullyQualifiedErrorId: [Server=SERVER,RequestId=ba479b62-bda0-4c55-9347-9279f6121d62,TimeStamp=3/18/2015 7:57:29 PM] [FailureCategory=Cmdlet-MailboxUnavailableException] 45AC6FDA,Microsoft.Exchange.Management.StoreTasks.SetMailboxRegionalConfiguration
Googled many answers, tried many workarounds, and I'm out of ideas now, so any suggestion will be more than welcome!
Thanks,
Ivica

Well, i would do that, except that Exchange 2013 don't have System attendant service.
Also, we have 6 databases, how do i know which one to put in homeMDB field?
I did as you instructed anyway for test and still receive error:
<?xml version="1.0"?>
<Objects>
<Object Type="System.Management.Automation.PSCustomObject">
    <Property Name="message" Type="System.String">Can't create user</Property>
    <Property Name="detailMessage" Type="System.String">Cannot open mailbox /o=secureemail/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=SERVER/cn=Microsoft System Attendant. CategoryInfo:
NotSpecified: (:) [Set-MailboxRegionalConfiguration], StorageTransientException, FullyQualifiedErrorId: [Server=SERVER,RequestId=557e3eb8-ddbb-44c9aab1-d18c0682beb5,TimeStamp=3/19/2015 2:45:32 PM] [FailureCategory=Cmdlet-StorageTransientException] 2CC71ED6,Microsoft.Excha
nge.Management.StoreTasks.SetMailboxRegionalConfiguration</Property>
    <Property Name="responseCode" Type="System.String">400</Property>
</Object>
</Objects>
Keep in mind that servers are in remote AD sites, replication and AD health is good!
This is script that is failing:
$ErrorActionPreference = "Stop";
try{
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn
$OrganizationName = "[email protected]" #User defined mail address
$organizationUnit = "OU=$OrganizationName,OU=users,DC=domain,DC=priv";
$name = "John"
#this should be asked in web interface (firstname)
$lastname = "Dpe"
#this should be asked in web interface (lastname)
$displayName = "John Doe" # this is display name in OWA and in all address books
$logonName = "john"    # this will be users choosen logon name (before @externaldomain.com)
$ExternalDomain = "example.com"        #this value user will enter as his wanted username and will use it together with his external domain name [email protected]
$UPN = "$LogonName@$ExternalDomain"   #this should remain to be done automatically and under assumption domain is provisioned!!
$DomainController = "server"   #this value must be specified based on domain controller in AD site where user will be created
$nonadmin = "$OrganizationName All Users"; #This is field for entire tenant management and members are used for calendar sharing
$database = "database"
$retentionPolicy = "DoNotRemove"
$customattribute1 = "$OrganizationName" #Add for possible manipulation of tenants for future need
$customattribute2 = "ServiceID"
$customattribute3 = "ContactID"
$customattribute4 = "ClientID"
$password =ConvertTo-SecureString 'Password123' -AsPlainText -Force
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-LastName "$lastname" -Displayname "$Displayname" -database $database -ResetPasswordOnNextLogon $false #This is part where user is created
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Start-Sleep -s 2;
Set-CASMailbox -identity "$UPN" -OwaMailboxPolicy Default -DomainController "$DomainController" #In this policy it is defined that user cant manage his password, as any future change will be managed globally here and automatically
applied to all users
Set-MailboxRegionalConfiguration -Identity "$UPN" -Language en-us -DomainController "$DomainController" -Confirm:$False
Set-MailboxFolderPermission -identity ${UPN}:\calendar -User default -accessrights none -DomainController "$DomainController"
add-MailboxFolderPermission -Identity ${UPN}:\calendar -user "$nonadmin" -AccessRights AvailabilityOnly -DomainController "$DomainController"    #only members of classic users can see free/busy
set-mailbox -identity $UPN -customattribute1 $customattribute1 -customattribute2 $customattribute2 -customattribute3 $customattribute3 -customattribute4 $customattribute4 -DomainController "$DomainController"
$mailbox | Set-CasMailbox -DomainController "$DomainController" -ActiveSyncEnabled $true -PopEnabled $true -ImapEnabled $true -OWAEnabled $true -MAPIEnabled $true; #adding script for created user to be returned after creation

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Hi
I am running a native Exchange 2010 environment and I created a room mailbox resource in Exchange. However I am receiving the following error when I try to view the properties
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Error:
The following error was generated when "$error.Clear();
if ($RoleIsDatacenter -ne $true -and $RoleIsDatacenterDedicated -ne $true)
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" was run: "Database is mandatory on UserMailbox.".
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Wes

Hello,
Please make sure you do exchange server upgrading or a clean exchange 2013 installation. If you do a upgrading, please refer to the similar thread to assign a database to the arbitration mailbox "SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}".
http://social.technet.microsoft.com/Forums/en-US/239cb4a6-4a07-4b9a-800c-974573bbff32/error-installing-step-12-mailbox-role-service-on-exchange-2013-cu2?forum=exchangesvrdeploy
Please make sure you have these permission "Schema Admins, Domain Admins and Enterprise Admins" to install exchange 2013 server.
If this is a clean exchange 2013 installation, please try to recreate the system mailbox to check the result.
Cara Chen
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Exchange 2013 mailbox restore fails cannot open mailbox microsoft system attendant

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