If you not find any solutions which successfully upgrade your PST file you don't need to dread .Using PST Conversion tool users can upgrade ANSI PST files to Unicode PST files and convert Unicode PST file to ANSI PST file. MS Outlook PST upgrade software is unique PST converter solutions to convert PST file to Outlook 2007 & 2003 or upgrade PST file to 2007 or 2003. In MS Outlook 2003/2007/window7 creates PST file with a file size limit of 20 GB. ANSI PST files created in MS Outlook 2000/2002/XP has the overall size limit of 2 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 file size limit to 20 GB. SysTools PST Upgrade software permits you to convert ANSI PST to Unicode PST and convert Unicode PST to ANSI PST. Users cannot not convert corrupt PST (already exceeds 2GB) file to Unicode MS Outlook (2003/2007/window7). PST Conversion software successfully converts Outlook 2000 to Outlook 2003. PST Converter Software converts all email folders such as Inbox, Outbox, Deleted Items, and Sent Items to a new PST file. PST Upgrade software performs conversion of ANSI PST to Unicode PST and Conversion of Unicode PST to ANSI PST. PST Conversion 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 runs with Windows XP/2000/2003/Vista Operating System without any problem. Download the Demo version of PST Upgrade Tool can convert only first 3 folders of PST files. Purchase the full version of Outlook PST Upgrade software to convert whole information of MS Outlook (2000/2002/XP) to MS Outlook (2003/2007).