The "New-MailboxImportRequest" cmdlet does not import all messages in a .pst file in the ANSI format in an Exchange Server 2010 environment

The New-MailboxImportRequest cmdlet does not import all messages in a .pst file in the old American National Standards Institute (ANSI) format in a Microsoft Exchange Server 2010 environment. Additionally, when you run the Get-MailboxImportRequestStatistics -id <mailboxname\requestname> -includereport | fl > report.txt command to generate the import log, you receive the following error message in the log file:Note This issue also occurs if you run the Exmerge.exe utility to create a .pst file, and then run the New-MailboxImportRequest cmdlet to import the .pst file into a mailbox.