I have closed Outlook yesterday with some e-mails opened.
When I launched Outlook this morning, this window appeared :
The first sentence is weird (it looks like an automatic translation, with errors).
Translated back to English, it means"Outlook closed while opening items".
I don't know what is the original string, but I suggest to replace it with something like :
"Outlook a été fermé avec des éléments ouverts.".