Hi all,I installed Exchange 2010 sucessfully but then I spoiled the installation by installing Office Communicator in the same machine... I was told it was better to start over so I formatted the drives, installed windows 2008 and I was hoping I could do a clean install of exchange 2010, however.... I am getting this error during the installation (see bold), I would appreciate any help. ThanksSummary: 13 item(s). 8 succeeded, 1 failed.Elapsed time: 00:18:34Organization PreparationCompleted Elapsed Time: 00:00:42Preparing SetupCompleted Elapsed Time: 00:00:00 Stopping ServicesCompleted Elapsed Time: 00:00:00 Copy Exchange FilesCompleted Elapsed Time: 00:05:34 Language FilesCompleted Elapsed Time: 00:11:55 Restoring servicesCompleted Elapsed Time: 00:00:00 LanguagesCompleted Elapsed Time: 00:00:04 Management ToolsCompleted Elapsed Time: 00:00:07 Hub Transport RoleFailed Error:The following error was generated when "$error.Clear(); if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) ) { Update-RmsSharedIdentity -ServerName $RoleNetBIOSName }" was run: "Database is mandatory on UserMailbox. Property Name: Database". Database is mandatory on UserMailbox. Property Name: Database Elapsed Time: 00:00:08 Client Access RoleCancelled Unified Messaging RoleCancelled Mailbox RoleCancelled Finalizing SetupCancelled

Hi,Did you remove Exchange by using add/remove programs or just formatted the drives. If this is the case then their will be some things left in the active directory. You should manually cleanup these objects, the article below describes the steps how to do this:http://msexchangehelp.wordpress.com/2010/02/10/manually-uninstall-last-exchange-2010-server-from-organization/Regards,JohanExchange-blog: www.johanveldhuis.nl

Hi Johan,I just formatted the drives.... what a terrible mistake, what was I thinking?I followed your instructions to manually uninstall exchange and rebooted the server and tried to re-install exchange but I got the same error when going through the Hub Transport Role installation: Hub Transport RoleFailed Error:The following error was generated when "$error.Clear(); if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) ) { Update-RmsSharedIdentity -ServerName $RoleNetBIOSName }" was run: "Database is mandatory on UserMailbox. Property Name: Database". Database is mandatory on UserMailbox. Property Name: Database Elapsed Time: 00:00:08

Hi Johan,I just formatted the drives.... what a terrible mistake, what was I thinking?I followed your instructions to manually uninstall exchange and rebooted the server and tried to re-install exchange but I got the same error when going through the Hub Transport Role installation: Hub Transport RoleFailed Error:The following error was generated when "$error.Clear(); if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) ) { Update-RmsSharedIdentity -ServerName $RoleNetBIOSName }" was run: "Database is mandatory on UserMailbox. Property Name: Database". Database is mandatory on UserMailbox. Property Name: Database Elapsed Time: 00:00:08 Hi there,In regards to your issue of 'Database is mandatory on UserMailbox. Property Name: Database', it is a known issue.See this KB for resolution: http://support.microsoft.com/kb/978776OliverOliver Moazzezi | Exchange MVP, MCSA:M, MCTS:Exchange 2010, BA (Hons) Anim | http://www.exchange2007.com | http://www.exchange2010.com | http://www.cobweb.com |

Or have a look at this post:http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/214ded66-f987-4023-9158-9a80e6477e2bRegards,JohanExchange-blog: www.johanveldhuis.nl

I follow this link instructions:http://trycatch.be/blogs/pdtit/archive/2009/11/22/quot-database-is-mandatory-on-usermailbox-property-name-database-quot-error-when-adding-additional-exchange-2010-server.aspxThey recommend to install CAS first then mailbox role then hub transport to avoid that error.I was able to install CAS with no errors but during the installation of the mailbox role I got the error:service msexchange throttling failed to startnow I cant continue with the installation of the hub transport role untill I am able to fix the mailbox role, I tried to uninstall it and it doesnt let me uninstall it either, I get the following error:this mailbox database contains one or more mailboxes or arbirtration mailboxes. Before you can remove this mailbox database you must disable, move or remove user mailboxes and move arbitration mailboxesSo I am completely stuck now....

Hi,Please check article that Oliver mentioned to remove the FederatedEmail e-mail account and then re-run the setup.When you try to install the Exchange Server 2010 Mailbox role, the installation process fails http://support.microsoft.com/kb/978776Besides, please check if you have arbitration mailbox. You can run the following cmdlt:Get-mailbox |fl name, arbitration.Regards,Xiu