//For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
// initialize outlookFormat
OutlookMessage outlookFormat = new OutlookMessage(Common.MapSourceFilePath(filePath));
// remove attachments
outlookFormat.RemoveAttachments();
// commit changes
outlookFormat.Save(Common.MapDestinationFilePath(filePath));