ToolsBaer for EML into Office 365 importer. Their interface is simple and easy to use and understand. It adds multiple EML files at once without any restrictions. It supports all Windows versions 10,8,7and others. Tool Maintenance attachments and email formatting. It shows a preview option before the process. Allow EML files from Windows Live Mail, Thunderbird, Outlook Express, and others. Completed errorless processing in just a few clicks. It provides a free demo version.