This article was previously published under Q197752
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NOTE: These procedures only apply if you have installed Outlook with the Internet Mail Only option. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Internet Mail Only option installed, you see "Internet Mail Only".
For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:
257824 OL2000: Differences Between Outlook and Outlook Express
This article discusses the purpose and capacity of the Personal Storestorage facilities used by the Internet Mail Only installation of Outlook.
A Personal Folder file, also known as a .pst, is the medium for storingMail Application Program Interface (MAPI) objects created or received byOutlook. Unlike a MS-DOS or Windows file system, the .pst is onlyaccessible by a MAPI aware program such as Outlook.
One or more .pst files can reside on your computer. A .pst can bedefined as your primary store, meaning that your mail is delivered to theInbox in that file and all of your other default Outlook folders, such asCalendar, Contacts, Deleted Items, Journal, Notes, Sent Items, and Tasksreside there. Or, a .pst file can be defined as a secondary store, meaningyou can move items to it, either manually or with Inbox Rules, from yourprimary store.
Each .pst file can contain 16,384 items. An item is either a folder, message, task, etc. Each folder can contain a maximum of 16,384 items. If you select the Allow upgrade to large tables option, each folder can contain up to 65,536 items. The total file size of a .pst cannot exceed 2 gigabytes (GB).
For more information about this subject, please see the following articlesin the Microsoft Knowledge Base:
195723 : OL2000: (IMO) Creating a New Personal Folder For an IMO Account