Need to convert old PST files? Looking for a best PST Conversion tool? or need to convert Outlook PST files? Your search for best PST Conversion utility ends here. PSTUPGARDE is a PST Conversion tool to convert PST files of MS Outlook. Using PST Conversion tool users can upgrade ANSI PST files having only 2 GB file size limit to Unicode PST files having file size limit of 20 GB and convert Unicode PST file to PST file. If you need to convert your old PST file created in Outlook 2000/2002/XP to a new PST file of Outlook 2003/2007, try using PST Conversion tool to convert PST file quickly & easily. PST files created using Microsoft Outlook 2003 and Microsoft Outlook 2007 have a larger overall size limit 20 gigabytes (GB) than the pst files that are created in the earlier versions of Microsoft Outlook such as Outlook 2000, 2002 & XP. In Outlook 2000, 2002 & XP and earlier, the PST files are in the American National Standards Institute (ANSI) format, and the overall size has a limit of 2 GB only. Once the ANSI PST file grows beyond 2 GB file size, it gets corrupted. So to safeguard your PST files against corruption imposed due to 2 GB limitation placed in ANSI PST, go get "PSTUPGRADE" and quickly upgrade your old pst files to new pst file format having 20 GB file limitation. PST Conversion software successfully converts Outlook 2000 to Outlook 2003. PST Converter Software convert all email folders such as Inbox, Outbox, Deleted Items, and Sent Items etc to a new PST file. PST Upgrade software perform 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. SysTools PST Upgrade tool successfully runs with Windows Windows XP/2000/2003/Vista Operating System.