Sometimes EM Client with outlook.com lose Mails

I’m using outlook.com. Sometimes EM lose a view of the last Mails. In this case the losed Mails are new fetched form the outlook.com server and every mail produce a notification.

Windows 7
EM Client 6.0.22313.0

Hello, sorry to see this, but unfortunately I’m not completely sure what you’re referring to, are you seeing any errors while trying to synchronize eM Client with your mail server?
Are your messages still available on the server? Also please try to update your eM Client to the latest release using the built-in check for update feature or this installer: 6.0.22344.0