1.) >>Fixit von Microsoft
https://support.microsoft.com/de-de/kb/958012

2.) Configuring Outlook to Not Send Winmail.dat Attachments
Set the Global Properties to have Outlook by default send your email in Hypertext Markup Language (HTML):

Outlook 2007: Select Tools > Options > Email Format > Internet Options. Select Convert to HTML format.
Outlook 2010 and 2013: Select File > Options > Mail and then scroll to the bottom of the dialog. Select Convert to HTML format.

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