PST Converter Software allows users to convert ANSI PST to Unicode PST. 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). Microsoft Outlook 2003 and Microsoft Outlook 2007 have a larger overall size limit 20 gigabytes (GB) for the personal folders (.pst) file than the .pst files that are in the earlier versions of Microsoft Outlook such as Microsoft Outlook 2000 & XP. In Outlook 2002 and earlier, the .pst files are in the American National Standards Institute (ANSI) format, and the overall size has a limit of 2 gigabytes (GB) only. Unicode PST file has the overall size limit of 20 GB. Just to avoid corruption due to exceeding the size limit of 2 GB imposed on ANSI PST file, you need to convert your ANSI PST file to Unicode PST file to enhance the size limit to 20 GB. Software successfully converts Outlook 2000 to Outlook 2003. For every conversion, PST Upgarde creates a new PST that is a replica, folder by folder, of an existing one. It makes no changes to the original PST file. PST Upgrade tool supports to import ANSI PST to Unicode PST file by converting the entire email folder like: Inbox, Outbox, Deleted Items, and Sent Items etc. Software efficiently performs PST conversion of ANSI PST to Unicode PST. Do not use PST Upgrade Tool to convert Converts oversized 2GB ANSI PSTs that Outlook cannot open to Unicode PST file. 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 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.