facing below error while creating new user mail box. Arvind

And you can try this; http://www.johnmen.com/johnmen/it-proprietary/microsoft-exchange-server/exchange-2010-couldnt-find-a-valid-mailbox-database-when-creating-new-mailbox.html

Hi Arvind, Per the error information, that means it is failed to find a mailbox database. So, could you please confirm the above suggestions, and then post the update here. Or, you could run EXBPA and post the error information here, then we could narrow down the issue. Regards!Gavin TechNet Community Support

Hello, can you try specifying the database in the New-Mailbox command instead of allowing it to be automatically chosen. Thanks

create seperate databse adb try to create user on new database,

Hi Arvind, Any update for for your issue? Regards!Gavin TechNet Community Support

any updates ?

Hello any update , did you tried specifying the database in the New-Mailbox command instead of allowing it to be automatically chosen. Thanks

pls update ??