The best software to PST to iCloud is the BLR PST Converter Tool, which is a reliable PST mail converter. It reads PST files and converts to the correspondent iCloud-supported format such as MBOX or EMLX with all mails, attachments and hierarchy intact. After the conversion, you can open the files in Apple mail and upload them to your iCloud account. The tool provides an easy and safe method of allowing a user to view outlook information on iCloud.