After the migration you will notice that there are unusual folder names that have been migrated from your Domino environment to your Exchange environment. You can avoid this by editing the INI file.
To filter out unwanted folder names from coming across you will need to edit the INI file You can do so through the following steps:
Edit notesdtapp.ini to include a [Filters] section and filter the folder names:
[Filters]
Filter[0]=(Group Calendars)
Filter[1]= (GroupCalendarFolder)