Emails Anhänge sind teilweise "404 not found"

[SoftwareFuxx]

Guten Morgen,

Ich muss mal wieder nerven weil ich einfach nicht weiter komme.

Ich zitier das Problem mal kurz:

o In Outlook, on his new computer, James can preview all messages in his mailbox. But when he attempts to open any message with an attachment received in 2016, he receives a “404 NOT FOUND” message within Outlook. Strangely, messages received in 2015 are opened successfully. His old computer does not experience this problem. The problem persists even when a new email profile is created on his new computer. If a new email profile is created on his old computer, the 2016 emails are successfully opened. This suggests the problem is isolated to his new computer and the way it interacts with your Exchange server.
 Can you think of any Outlook add-on that is necessary to download attachments from your server that may have not been installed on the new computer?

Schon 1000 sachen im Outlook gemacht, aber davon hab ich noch nie gehört, wenn es auf beiden Maschinen wäre, wärs ja relativ einfach aber so ergibt das kein Sinn. Und google findet dazu auch nichts was zutrifft.

Hätte jemand vielleicht eine Idee ?

Liebe Grüsse,

SoftwareFuxx