Uninstall exchange 2016 question

This will be helpful

https://technet.microsoft.com/en-us/library/aa995948(v=exchg.160).aspx

any idea what i goes wrong ?

Check for Audit mailbox too

Get-Mailbox -AuditLog -Database <DatabaseName>

Also  rather deleting these system mailboxes I would suggest to move them in any other server if you have.

http://www.mustbegeek.com/delete-default-mailbox-database-exchange-2016/

all related mailbox has removed, but i still having issue to remove the mail database any idea ?

Please run Get-Mailbox -AuditLog -Database <DatabaseName>  and share the output ,What error you are getting now? is it same?

i,m getting this, any idea ?

Try running below CMD:

Get-Mailbox -AuditLog -Database <DatabaseName> |  New-MoveRequest –TargetDatabase <Target Databse Name>

and keep checking the move status

https://technet.microsoft.com/en-us/library/ee332315(v=exchg.160).aspx

What about If I don't have a target database ? I only have a single database

Run the below cmd

Get-Mailbox -ResultSize Unlimited -Filter {RecipientTypeDetails -eq "UserMailbox"} | Format-List Name,Audit*

Get-Mailbox -ResultSize Unlimited -Filter {RecipientTypeDetails -eq "UserMailbox"} | Set-Mailbox --AuditEnabled $false


Get-Mailbox -Arbitration -Database <MailboxDatabase> | Disable-Mailbox -Arbitration -DisableLastArbitrationMailboxAllowed

Get-Mailbox -Arbitration -Database <MailboxDatabase> | Disable-Mailbox

Then try to remove it

Hi

       For the "UserMailbox" , does it mean the "systemMailbox" ? if yes, how i can check the full name of the SystemMailbox ?