If you required to upgrade your Ansi PST (MS Outlook 2000/2002/XP) file in to Uni code PST(MS Outlook 2003/2007)file because your pst file size increase more than 2 GB limits? Get SysTools PST Conversion software and quickily convert ANSI PST to UNICODE PST. When users convert ANSI PST to Unicode PST, PST Upgrade software maintains all meta information of emails. Ansi format has the overall limit of 2GB, once the file grows beyond 2GB then it has the maximum chance to get corrupted. So to safe your pst file against corruption, you need PST Conversion software which is the single solution to convert Ansi PST to Unicode PST files. Microsoft Outlook like MS Outlook 2003 and MS Outlook 2007 has overall size limit 20 GB for the storing of personal folders (.pst) file. In MS Outlook 2002 and older versions, the .pst files are in the ANSI format and have the size limit of 2 GB only, While Unicode PST file has the overall size limit of 20 GB. PST Conversion Utility successfully converts MS Outlook 2000 to MS Outlook 2003.For each type of conversion, PST Conversion software creates a new PST that is a replica, folder by folder, of an existing one. Software does not make any changes to the original PST file. PST Upgrade software makes importable ANSI PST to Unicode PST file by converting all existing email folder like: Inbox, Outbox, Sent Items, Deleted Items etc. PST Conversion powerfully performs transfer of ANSI PST to Unicode PST. PST Conversion used to convert oversized 2GB ANSI PST to Unicode PST file. PST Upgrade tool converts ANSI PST file showing "Properties for this information service must be defined prior to use" to Unicode PST file conveniently. PST Conversion also converts Unicode PST (MS Outlook 2003/2007) to Ansi PST (MS Outlook 2000/2002/XP). PST Conversion software requires a valid configured profile of MS Outlook 2003 & 2007 installed. SysTools PST Conversion software successfully runs with Windows XP/2000/2003/Vista Operating System.