"Apple no longer offers Safari updates for Windows. Safari 5.1.7 for Windows was the last version made for Windows, and it is now outdated." Should I understand it is now definitely not possible to load Mail messages with a PC connected to icloud ?

The system I'm using is MS Windows 10 Enterprise. I'm trying to read my mailbox messages on icloud, and it appears this message, I have access to the mailbox, but not to the content of the messages, the following message appears : "This message cannot be loaded at this time. Try again later", and I have tried again, and again, and again, trying to connect with my phone connection only, avoiding the network of my company. Still the same ... I have no idea on how it can be done ... thank you for your help ...