What are Unicode PST files in Outlook?
Posted by Swift Admin, Last modified by Jim Beveridge on 29 August 2014 11:14 AM
Versions of Outlook prior to 2003 had a limitation that the PST files (where messages are stored) could not exceed 2GB size, or they would become corrupted. The older versions of Outlook also had a second limitation in that they could only represent the user's default character set. This meant that users in the United States (for example) couldn't receive messages in Japanese or Chinese.
 
In Outlook 2003, Microsoft redesigned the PST file so it could exceed 2GB and it could hold any language. These PST files use Unicode to allow the representation of all character sets.
 
Outlook 2003 through Outlook 2013 automatically create Unicode PST files. However, if you upgrade an installation of Outlook, your PST file will not be upgraded and you must therefore be careful not to exceed the 2GB limit.
 
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