Issue with Outlook (Microsoft 365)

Hello.

I've an issue with Outlook when it's synchronising with server (receiving with pop.proximus.be).

When I do Send/Receive, I show the mails but the synchronisation never finishes.  It's stay blocking at last mail.

However, I can see others mails synchronized and can open open them.

I recreate my profile without success.

What do you suggest ?

Thanks