I just went to the Region settings in Windows 10.

I got to the “Change data formats” link and hit enter.

I tabbed to the short date format and arrowed down to April 5, 17 and hit enter.

I went back to your message in outlook and the date read as: Sent Fri 26-Mar-21 10:24 AM

Is that what you want it to say?

Hi, Brian. My version of Outlook is 2010. What I see no setting for is to change the numeric month value to a name value, even if the format is changed from compact to single line view.

Bill White

billwhite92701@...

From: main@jfw.groups.io [mailto:main@jfw.groups.io] On Behalf Of Brian Vogel
Sent: Friday, March 26, 2021 10:18 AM
To: main@jfw.groups.io
Subject: Re: Outlook, change number of month displayed to name of month

On Fri, Mar 26, 2021 at 01:13 PM, Richard Turner wrote:

I’m pretty sure that Outlook is just pulling the info from the regional format settings….

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That's my presumption, too.  But I still want to know where in Outlook (and what version, for that matter) we're talking about.  

I see Bill has provided the where, so I need to fire up Outlook 2016 (which is all I have, but it's the base code for 2019 and 365, so it should do) to see what deep, dark setting in Outlook is used to decide what to snag.

One can change the short date format to something like:  25-March-2021.  If it is snagging from short date, and that would be adequate, I'd actually try tweaking the short date format via its combo box first (see my previous message for location in Settings).
 
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Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042  

To think is to differ.
      ~ Clarence Darrow