I am installing 2013 mailbox into my 2010 sp3 exchange org. I have already installed a 2013 CAS which worked ok. I am getting the ofllowing error: Error: The following error was generated when "$error.Clear(); if ($RoleIsDatacenter -ne $true) { if (Test-ExchangeServersWriteAccess -DomainController $RoleDomainController -ErrorAction SilentlyContinue) { $sysMbx = $null; $name = "SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}"; $dispName = "Microsoft Exchange"; Write-ExchangeSetupLog -Info ("Retrieving mailboxes with Name=$name."); $mbxs = @(Get-Mailbox -Arbitration -Filter {name -eq $name} -IgnoreDefaultScope -ResultSize 1 ); if ($mbxs.Length -eq 0) { Write-ExchangeSetupLog -Info ("Retrieving mailbox databases on Server=$RoleFqdnOrName."); $dbs = @(Get-MailboxDatabase -Server:$RoleFqdnOrName -DomainController $RoleDomainController); if ($dbs.Length -ne 0) { Write-ExchangeSetupLog -Info ("Retrieving users with Name=$name."); $arbUsers = @(Get-User -Filter {name -eq $name} -IgnoreDefaultScope -ResultSize 1); if ($arbUsers.Length -ne 0) { Write-ExchangeSetupLog -Info ("Enabling mailbox $name."); $sysMbx = Enable-Mailbox -Arbitration -Identity $arbUsers[0] -DisplayName $dispName -database $dbs[0].Identity; } } } else { if ($mbxs[0].DisplayName -ne $dispName ) { Write-ExchangeSetupLog -Info ("Setting DisplayName=$dispName."); Set-Mailbox -Arbitration -Identity $mbxs[0] -DisplayName $dispName -Force; } $sysMbx = $mbxs[0]; } # Set the Organization Capabilities needed for this mailbox if ($sysMbx -ne $null) { # We need 1 GB for uploading large OAB files to the organization mailbox Write-ExchangeSetupLog -Info ("Setting mailbox properties."); set-mailbox -Arbitration -identity $sysMbx -UMGrammar:$true -OABGen:$true -GMGen:$true -ClientExtensions:$true -MailRouting:$true -MessageTracking:$true -MaxSendSize 1GB -Force; } else { Write-ExchangeSetupLog -Info ("Cannot find arbitration mailbox with name=$name."); } } else { Write-ExchangeSetupLog -Info "Skipping creating E15 System Mailbox because of insufficient permission." } } " was run: "The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found.". The tail of my setup log looks like so: [04/25/2013 22:58:47.0105] [2] [ERROR] The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found. [04/25/2013 22:58:47.0105] [2] [ERROR] The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found. [04/25/2013 22:58:47.0105] [2] Ending processing Enable-Mailbox [04/25/2013 22:58:47.0105] [2] Cannot find arbitration mailbox with name=SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}. [04/25/2013 22:58:47.0105] [1] The following 1 error(s) occurred during task execution: [04/25/2013 22:58:47.0105] [1] 0. ErrorRecord: The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found. [04/25/2013 22:58:47.0105] [1] 0. ErrorRecord: Microsoft.Exchange.Data.Storage.UnableToFindServerForDatabaseException: The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found. at Microsoft.Exchange.Configuration.Tasks.Task.ThrowError(Exception exception, ErrorCategory errorCategory, Object target, String helpUrl) at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target) at Microsoft.Exchange.Management.RecipientTasks.EnableMailbox.GetDatabaseLocationInfo(Database database) at Microsoft.Exchange.Management.RecipientTasks.EnableMailbox.InternalValidateAndSetArchiveDatabase(DatabaseIdParameter databaseId, Int32 minServerVersion, Boolean throwOnError, Database& database, DatabaseLocationInfo& databaseLocationInfo) at Microsoft.Exchange.Management.RecipientTasks.EnableMailbox.ValidateAndSetDatabase(DatabaseIdParameter databaseId, Boolean throwOnError) at Microsoft.Exchange.Management.RecipientTasks.EnableMailbox.InternalValidate() at Microsoft.Exchange.Configuration.Tasks.Task.ProcessRecord() [04/25/2013 22:58:47.0121] [1] [ERROR] The following error was generated when "$error.Clear(); if ($RoleIsDatacenter -ne $true) { if (Test-ExchangeServersWriteAccess -DomainController $RoleDomainController -ErrorAction SilentlyContinue) { $sysMbx = $null; $name = "SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}"; $dispName = "Microsoft Exchange"; Write-ExchangeSetupLog -Info ("Retrieving mailboxes with Name=$name."); $mbxs = @(Get-Mailbox -Arbitration -Filter {name -eq $name} -IgnoreDefaultScope -ResultSize 1 ); if ($mbxs.Length -eq 0) { Write-ExchangeSetupLog -Info ("Retrieving mailbox databases on Server=$RoleFqdnOrName."); $dbs = @(Get-MailboxDatabase -Server:$RoleFqdnOrName -DomainController $RoleDomainController); if ($dbs.Length -ne 0) { Write-ExchangeSetupLog -Info ("Retrieving users with Name=$name."); $arbUsers = @(Get-User -Filter {name -eq $name} -IgnoreDefaultScope -ResultSize 1); if ($arbUsers.Length -ne 0) { Write-ExchangeSetupLog -Info ("Enabling mailbox $name."); $sysMbx = Enable-Mailbox -Arbitration -Identity $arbUsers[0] -DisplayName $dispName -database $dbs[0].Identity; } } } else { if ($mbxs[0].DisplayName -ne $dispName ) { Write-ExchangeSetupLog -Info ("Setting DisplayName=$dispName."); Set-Mailbox -Arbitration -Identity $mbxs[0] -DisplayName $dispName -Force; } $sysMbx = $mbxs[0]; } # Set the Organization Capabilities needed for this mailbox if ($sysMbx -ne $null) { # We need 1 GB for uploading large OAB files to the organization mailbox Write-ExchangeSetupLog -Info ("Setting mailbox properties."); set-mailbox -Arbitration -identity $sysMbx -UMGrammar:$true -OABGen:$true -GMGen:$true -ClientExtensions:$true -MailRouting:$true -MessageTracking:$true -MaxSendSize 1GB -Force; } else { Write-ExchangeSetupLog -Info ("Cannot find arbitration mailbox with name=$name."); } } else { Write-ExchangeSetupLog -Info "Skipping creating E15 System Mailbox because of insufficient permission." } } " was run: "The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found.". [04/25/2013 22:58:47.0121] [1] [ERROR] The active server for database Mailbox Database 1067990391 (457ad99c-9611-43c5-9120-693e0e25709e) could not be found. [04/25/2013 22:58:47.0121] [1] [ERROR-REFERENCE] Id=SystemAttendantDependent___1DEE95834DBA48F2BB211C2FB6765A5A Component=EXCHANGE14:\Current\Release\Client Access\Unified Messaging [04/25/2013 22:58:47.0121] [1] Setup is stopping now because of one or more critical errors. [04/25/2013 22:58:47.0121] [1] Finished executing component tasks. [04/25/2013 22:58:47.0152] [1] Ending processing Install-MailboxRole [04/25/2013 23:01:54.0734] [0] End of Setup [04/25/2013 23:01:54.0734] [0] ********************************************** I have no idea what arbitration mailbox it is referencing. When I goto look I just see: [PS] C:\Windows\system32>Get-Mailbox -Arbitration | ft -autosize Name Alias ---- ----- SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 SystemMailbox{1f05a927-5bcf-4646-94aa-cf347ddcfe3e} SystemMailbox{1f05a927-5bcf-4646-94aa-cf347ddcfe3e}

Figured it out, was some leftover databases from previous failed mailbox installations on this server which I deleted from the configuration in ADSI edit. It's been a rough ride getting this going, 3 server wipes later I think I'm ready to roll.