Word has a feature so that when you start to type for instance part of a date, it gives you a suggestion in a popup. This is highly eneverating with Swedish settings, since every time I type "den" (same as "the" in English, i.e., very common) I get a popup to insert today's date, as the long format for the regional settings in Swedish starts with "den".

In Word proper, this is possible to turn off  with this Macro:

' Dda Autocomplete!
Public Sub MAIN()
   Application.DisplayAutoCompleteTips = False
End Sub

But I have not been able to inject this macro or turn off this insanity by other means in Outlook 2013. Any tips? The screenshot below illustrates. (The popup is the box that says "den 16 juli 2015 (Press ENTER to Insert)

Hi,

What you described is a feature of Autocomplete. We can turn off the Autocomplete by going to File > Options > Mail > Spelling and Autocorrect > Advanced and disabling the "Show AutoCorrect Suggestions" option.

Best Regards,

Steve Fan
TechNet Community Support

Thanks Steve, that was it! Somehow, I had failed to observe the Advanced page.