I recently switched from Office 2003 to Office 2007.
In Outlook 2003 I was able to sort my Tasks based upon their names (Subjects), but in Outlook 2007 I get the following error message:
“You cannot sort by this field”
To resolve if you need to remove Task Subject from the view and replace it with Subject.
- Right click on the column heading
- Select customise current view
- Click on fields
- Add subject, remove task subject
- Now it you will be able to sort by the subject field