I got this error message when I installed Exchange 2010. Has anyone else had this problem or know how I can fix it? Thank you Summary: 12 item(s). 10 succeeded, 1 failed. Elapsed time: 01:30:47 Organization Preparation Completed Elapsed Time: 00:09:15 Preparing Setup Completed Elapsed Time: 00:00:00 Stopping Services Completed Elapsed Time: 00:00:01 Copy Exchange Files Completed Elapsed Time: 00:17:17 Language Files Completed Elapsed Time: 00:50:14 Restoring services Completed Elapsed Time: 00:00:01 Languages Completed Elapsed Time: 00:00:13 Management Tools Completed Elapsed Time: 00:00:19 Hub Transport Role Completed Elapsed Time: 00:05:06 Client Access Role Completed Elapsed Time: 00:03:11 Mailbox Role Failed Error: The following error was generated when "$error.Clear(); $name = [Microsoft.Exchange.Management.RecipientTasks.EnableMailbox]::DiscoveryMailboxUniqueName; $dispname = [Microsoft.Exchange.Management.RecipientTasks.EnableMailbox]::DiscoveryMailboxDisplayName; $dismbx = get-mailbox -Filter {name -eq $name} -IgnoreDefaultScope -resultSize 1; if( $dismbx -ne $null) { $srvname = $dismbx.ServerName; if( $dismbx.Database -ne $null -and $RoleFqdnOrName -like "$srvname.*" ) { Write-ExchangeSetupLog -info "Setup DiscoverySearchMailbox Permission."; $mountedMdb = get-mailboxdatabase $dismbx.Database -status | where { $_.Mounted -eq $true }; if( $mountedMdb -eq $null ) { Write-ExchangeSetupLog -info "Mounting database before stamp DiscoverySearchMailbox Permission..."; mount-database $dismbx.Database; } $mountedMdb = get-mailboxdatabase $dismbx.Database -status | where { $_.Mounted -eq $true }; if( $mountedMdb -ne $null ) { $dmRoleGroupName = "Discovery Management"; $dmRoleGroup = Get-RoleGroup -Identity $dmRoleGroupName -DomainController $RoleDomainController -ErrorAction:SilentlyContinue; if( $dmRoleGroup -ne $null ) { Add-MailboxPermission $dismbx -User $dmRoleGroup.Identity -AccessRights FullAccess -DomainController $RoleDomainController -WarningAction SilentlyContinue; } } } }" was run: "Couldn't mount the database that you specified. Specified database: Mailbox Database 0292024885; Error code: An Active Manager operation failed with a transient error. Please retry the operation. Error: A transient error occurred during discovery of the database availability group topology. Error: Database action failed with transient error. Error: A transient error occurred during a database operation. Error: MapiExceptionJetErrorOutOfMemory: Unable to mount database. (hr=0x80004005, ec=-1011) [Database: Mailbox Database 0292024885, Server: WIN-9ABE1R1DR78.DerbyDerm.com].". Couldn't mount the database that you specified. Specified database: Mailbox Database 0292024885; Error code: An Active Manager operation failed with a transient error. Please retry the operation. Error: A transient error occurred during discovery of the database availability group topology. Error: Database action failed with transient error. Error: A transient error occurred during a database operation. Error: MapiExceptionJetErrorOutOfMemory: Unable to mount database. (hr=0x80004005, ec=-1011) [Database: Mailbox Database 0292024885, Server: WIN-9ABE1R1DR78.DerbyDerm.com]. An Active Manager operation failed with a transient error. Please retry the operation. Error: A transient error occurred during discovery of the database availability group topology. Error: Database action failed with transient error. Error: A transient error occurred during a database operation. Error: MapiExceptionJetErrorOutOfMemory: Unable to mount database. (hr=0x80004005, ec=-1011) [Database: Mailbox Database 0292024885, Server: WIN-9ABE1R1DR78.DerbyDerm.com] An Active Manager operation failed with a transient error. Please retry the operation. Error: MapiExceptionJetErrorOutOfMemory: Unable to mount database. (hr=0x80004005, ec=-1011) [Server: WIN-9ABE1R1DR78.DerbyDerm.com] MapiExceptionJetErrorOutOfMemory: Unable to mount database. (hr=0x80004005, ec=-1011) Elapsed Time: 00:05:06 Finalizing Setup Cancelled

Hi I always meet this error on Hyper-V server. It is issue with memory settings. You should increase the memory. You can read this KB to calculate memory of your server. http://technet.microsoft.com/en-us/library/dd346700.aspx If your memory is enough, you can install mailbox role separately. Then you can install other role on this server. Exchange setup directory “setup /m:install /r:mailbox”