How can you set the default value for the 'Description' field for a SharePoint 2010 calendar list? There is nothing in the web interface for doing this, so I have tried it with PowerShell.
$w = Get-SPWeb -Identity http://SPSite
$l = $w.Lists["My Calendar"]
$f = $l.Fields["Description"]
$f.DefaultValue = "default value"
$f.Update()
It runs without any exceptions occurring, but does not set the default value.
I want to include some text in the description field that shows when adding a new event via SharePoint or Outlook 2010.