You run the New-MailboxImportRequest cmdlet to import a .pst file into a mailbox in a Microsoft Exchange Server 2010 environment. In this situation, the Microsoft Exchange Mailbox Replication Service service crashes. Additionally, the following event is logged in the Application log:
This issue occurs because the value of a variable is set to Null. However, there is no check for null variables before the Microsoft Exchange Mailbox Replication Service service accesses the variable.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.