The Demo and Professional versions of Stellar Repair for Outlook scan and repair corrupt PST files, but they are different in usage in the following ways:

Demo Version

Professional Version
  1. It is the baseline trial version of the software which is available for free download.

It is the full version of the software, which is registered and activated by using a paid license key.
  1. Provides a preview of repaired Outlook components – emails, attachments, contacts, calendars, tasks, notes, and journals.

Along with preview, it also saves the mailbox components – emails, attachments, contacts, calendars, tasks, notes, and journals
  1. Helps in evaluating the core file repair function of the software. Cannot save the repaired mailbox items.

Can save the repaired components in multiple file formats viz. PST, EML, MSG, RTF, HTML, and PDF.
  1. Cannot save the scanned information.

Saves the scanned information in DAT file format for reinstating the file repair process anytime later.

The Demo version of the software helps evaluate what the software can do for the users. To access the full functionality of the software, use the Professional version.