02-09-2011 12:49 PM
You can't - that field and others such as Last Meeting are updated automatically by ACT! e.g. when the Activity is Cleared for a Meeting.
If you want to record the fact that an email has been sent, other than setting up ACT! or Outlook mail, there is an option in Record History to do this - choose the type Other and then the option "Email sent" will be available in the Result drop down - this will update the field for you. If you change the date in the History then that is the date that will be used.