After Microsoft's June 13, 2017 security updates KB3203467 und KB3191898 users of Outlook 2007, 2010, 2013 and 2016 are observing several issues. Outlook can't open RTF attachments after installing these security updates. Microsoft has now released a document addressing some of those issues. Further details may be read within my blog post Office/Outlook und Windows Patchday issues.
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