Hi Huy
thank you for your feedback.
On 1: the emails that I am missing are not displayed when I log in on the hotmail.com domain.
On 2: Tried all that, makes no difference
On 3: I changed passwords on the account (as somebody told me that this would help). No change
What is strange ist that when I get the notification, I know that an email came. If I open the email from clicking the notification of the email, I can open it but then it disappears (to God knows where) again very fast. I do not know where it goes as I have no knowing filters installed or no knowing actions installed in outlook that will move the emails somewhere.
Any other idea that you have? I am not sure I will get any help from Microsoft ... but I will log a question now.
Best regards
Christoph