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You can use the Exchange Management Console to view who last logged on to a mailbox, last logon date and time, mailbox size, and message count by the following Steps:

  • From Exchange Management Console, expand the Recipient Configuration node, and then select the related Mailbox node.
  • Double-click the mailbox with which you want to see.
  • On the General tab, the Last Logged On By text box shows who last logged on to the mailbox and the last logon date and time.
  • On the General tab, the Total Items and Size (KB) areas show the number of messages in the mailbox and the current mailbox size in kilobytes, respectively.

    • The Same details are also can be obtained using Get-MailboxStatistics cmdlet.
    To Do this:

    Syntax
    Get-MailboxStatistics [-Server 'Server' | -Identity 'Identity' | -Database 'Database']
    Usage
    Get-MailboxStatistics -Server ‘ServerName’ Get-MailboxStatistics -Database ‘ServerName\DB-Name Group\GroupName’
    Get-MailboxStatistics -Identity ‘cpandl\NameOfTheUser’