Now upgrade your PST format is very easy with SysTools PST Upgrade software .When Microsoft released higher versions (2003 & 2007) of Microsoft Outlook, then users of Outlook 2000/2002 started searching for a product which can successfully convert ANSI PST to Unicode PST. This urge to convert ANSI to Unicode is because of the main drawback with ANSI PST file which is maximum size limit (only 2 GB) whereas in Unicode PST the size limit is of 20 GB. This Outlook PST Upgrade software can be used for converting Outlook 2000/2002 to Outlook 2003/2007. Even if you need to degrade Outlook PST file from Unicode to ANSI, then also this Outlook PST converter software can help. Outlook PST conversion will help you in the Outlook PST convert process can be performed by transferring all data from your mailbox folders like calendars, to-do-list etc. For every conversion, Outlook PST Upgrade creates a new PST that is a replica, folder by folder, of an existing one. It makes no changes to the original PST file. This PST conversion software just converts Unicode PST File to ANSI PST file and creates a new PST file. SysTools PST upgrade successfully runs with Windows XP/2000/2003/Vista & Windows7 Operating System. Before you decide to buy this software you can see all its features using the trial version and then purchase the full version at just $49 for personal license and $129 for business license.