The source Notes Mail database is in English language and English Outlook is installed but upon migrating to PST the System Folders (inbox, sent etc) are in another language. This information can also be used to migrate to a non-English language.
The Locale of the Windows OS that Migrator for Notes to Exchange (MNE) is running on has been set to the language of the country that MNE is running in but not the target mailbox language.
Set the language format and locale to the desired target language, (in this case English) under Regional and Language Settings control panel in Windows:
1.) Open the Language Control Panel and set the language to the desired target Exchange Inbox language:
2.) Click on Change date, time or number formats | Administrative tab to set the system locale: