The following are the prerequisites for creating a mailbox.

1. Windows PowerShell 2.0 or above should be installed in your system.

2. TCP port 80 must be open between your computer and the remote Exchange Server.

3. Ensure that the account configured under Domain Settings of ADManager Plus has suitable privileges to create a mailbox.

4. Remote PowerShell must be enabled for the user account specified in Domain Settings.

5. Execute the following commands in Windows PowerShell of the computer where ADManager Plus is installed to verify whether the prerequisite conditions are met.
   $UserCredential=Get-Credential
   $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://<exchange server name>;/PowerShell/ -Authentication kerberos -Credential $UserCredential
   Import-PSSession $Session

The following prerequisites are specific to creating a mailbox in Exchange 2007.    

1. A 64 bit Edition of ADManager Plus should be installed on a compatible machine. You can find the architecture of the existing installation from the Product.conf file located at \ManageEngine\ADManager Plus\conf.

2. To create Mailbox Enabled Users in Exchange 2007, you would require the corresponding version of Exchange Management Console (EMC) on the same machine where ADManager Plus is installed. Otherwise, only legacy mailboxes will be created.

3. If ADManager Plus is running in console mode, then you must log on to the machine as an administrator (exchange administrator).

4. If ADManager Plus is installed as service, then configure the service account with administrator (exchange administrator) privileges by following these steps,

• Click Start > Run > services.msc.

• Right click on Manageengine ADManager Plus.

• Click Properties and navigate to the Log On tab.

• Select This account and enter the credentials.

• Click OK.