Cannot uninstall Exchange 2013 - Cannot get ecp page too.

Question

I am trying to install Exchange 2013 and we already have Exchange 2007 in our production environment.
Running the command get-exchangeserver |fl give the following. It shows IsCleintAccessServer : False, I am pretty sure I did select both the roles at the time of installation.
IsHubTransportServer            : True
IsClientAccessServer            : False
IsExchange2007OrLater           : True
IsEdgeServer                    : False
IsMailboxServer                 : True
IsE14OrLater                    : True
IsE15OrLater                    : True
IsProvisionedServer             : False
IsUnifiedMessagingServer        : True
IsFrontendTransportServer       : False
I can see all the virtual folders in IIS and while trying to access the ecp page using https://localhost:444/ecp?exchclientver=15, it says "Sorry! Access Denied".
Get-ecpvirtualdirectory gives no output.
If I try to uninstall I get the following error.
Error:
Uninstall can't continue. Database Mailbox Database 0424069483 : This mailbox database contains one or more mailboxes, mailbox plans, archive mailboxes, public folder mailboxes or arbitration mailboxes. To get a list of all mailboxes in this database, run the
command Get-Mailbox -Database <Database ID>. To get a list of all mailbox plans in this database, run the command Get-MailboxPlan. To get a list of archive mailboxes in this database, run the command Get-Mailbox -Database <Database ID> -Archive.
To get a list of all public folder mailboxes in this database, run the command Get-Mailbox -Database <Database ID> -PublicFolder. To get a list of all arbitration mailboxes in this database, run the command Get-Mailbox -Database <Database ID> -Arbitration.
To disable a non-arbitration mailbox so that you can delete the mailbox database, run the command Disable-Mailbox <Mailbox ID>. To disable an archive mailbox so you can delete the mailbox database, run the command Disable-Mailbox <Mailbox ID> -Archive.
To disable a public folder mailbox so that you can delete the mailbox database, run the command Disable-Mailbox <Mailbox ID> -PublicFolder. Arbitration mailboxes should be moved to another server; to do this, run the command New-MoveRequest <parameters>.
If this is the last server in the organization, run the command Disable-Mailbox <Mailbox ID> -Arbitration -DisableLastArbitrationMailboxAllowed to disable the arbitration mailbox. Mailbox plans should be moved to another server; to do this, run the command
Set-MailboxPlan <MailboxPlan ID> -Database <Database ID>. It was running the command 'Remove-MailboxDatabase 'CN=Mailbox Database 0424069483,CN=Databases,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=XYZ,CN=Microsoft
Exchange,CN=Services,CN=Configuration,DC=XYZ,DC=X,DC=X' -whatif'.
I would like to uninstall this server and do a fresh install. Tried recover option too, still facing same problem.
HELP!!!

Answer 1

Hi,
I suggest re-install CAS role for test whether it works.
If not, please uninstall the MBX role as what you want. I suggest make a full backup if there is any data in the Exchange server, then remove the mailbox database.
Found an article for your reference:
Cannot remove mailbox database
http://technet.microsoft.com/en-us/library/ms.exch.setupreadiness.unwillingtoremovemailboxdatabase(v=exchg.150).aspx
After uninstall the Exchange server, I suggest double check whether there is anything leave in AD via ADSIEdit tool. Then re-install Exchange server.
Thanks
Mavis
Mavis Huang
TechNet Community Support