Have you ever noticed that there are several date and time fields associated with activities in CRM? It can quickly become confusing to the user. One thing most people want to see is the date when an email was sent. By default, CRM provides the Modified On date in most of the email views. In some cases this may be the same as the sent date but not if you're tracking an older email from Outlook. To help with this issue, you can use the Actual End date as the email sent date. I will usually add this column to all of my email views.