Trying to import MSG files into iCloud Mail with attachments intact, you first need to convert MSG files into a compatible format such as EML or MBOX. iCloud Mail does not support direct MSG uploads, so using a reliable conversion tool like MacGater Mac MSG Converter is essential. After conversion, open the resulting files in a supported email client like Apple Mail. Then, configure your iCloud account in the client using IMAP settings. Once connected, simply drag and drop the converted emails into your iCloud mailbox folders. This method ensures that all attachments, metadata, and folder hierarchy remain preserved. For bulk or error-free conversion, a professional solution like MacGater Mac MSG Converter can simplify the process by maintaining data integrity and supporting direct migration to cloud platforms, including iCloud, without data loss or formatting issues.