How to convert 2003 to Outlook 2000? We suggest you to use Outlook PST conversion tool that smoothly convert Outlook 2003 to 2000 PST or to convert Unicode PST to ANSI PST. Software can be used ad PST Downgrade tool that easily convert Unicode PST to ANSI PST file format. ANSI is the old version of Outlook like Outlook 97, 2000 and Outlook 2002 and Unicode is the upgrade versions of Outlook like Outlook 2003, 2007 and Outlook 2010 (32-bit). You can open your Unicode PST file while showing error "Properties for this information service must be defined prior to use" to ANSI PST file. ANSI Outlook PST file contains 2GB limitation and Unicode contains 20GB limitation. And you can extent your PST file size with this Upgrade PST tool. You can use demo version of PST Upgrade software for evaluating the upgrading process. After full satisfaction you can purchase full license of this software only at $49 that is very affordable price to convert your PST files. For more info: