The Outlook data file %s has reached the maximum size. To reduce the amount of data in this file, permanently delete some ...

The Outlook data file %s has reached the maximum size. To reduce the amount of data in this file, permanently delete some items that you no longer need. You could also consider switching to Unicode mode and using the new Outlook data file (.ost) introduced with Outlook 2003 that provides greater capacity for storing items and folders.