SysTools PST Upgrade software allows users to convert ANSI PST to Unicode PST and vice versa. While converting ANSI PST to Unicode PST, software maintains all the emails meta-information intact. PST Upgrade tool do not allow users to convert corrupt pst files (that have already exceeded 2GB size). Software successfully converts Outlook 2000 to Outlook 2003. PST Upgrade tool supports to convert the entire email folder like: Inbox, Outbox, Deleted Items, and Sent Items etc. Software efficiently performs conversion of ANSI PST to Unicode PST and Conversion of Unicode PST to ANSI PST. PST Upgrade Software converts ANSI PST file showing "Properties for this information service must be defined prior to use" to Unicode PST file quickly and easily. PSTUPGRADE Software converts Outlook 2000 to Outlook 2003 Software can be used as both PST Upgrade tool & PST Degrade Tool. PSTUPGRADE software require a valid configured profile of MS Outlook 2003 & 2007 installed. SysTools PST Upgrade tool successfully runs with Windows Windows XP/2000/2003/Vista Operating System.