Increase the storage capacity of your data file

Whether you can increase the storage capacity of your data file depends on the settings and policies enforced by your administrator. However, you can use a data file in the new Microsoft Outlook Personal Folders file (.pst) format that offers greater storage capacity for items and folders to obtain greater storage capacity from your data file.

There is no automatic way of converting a Microsoft Outlook 97-2002 Personal Folders file (.pst) to a Microsoft Outlook Personal Folders file (.pst) format. The easiest way is to create a new data file in the Microsoft Outlook Personal Folders file (.pst) format and then import items from the old data file to the new Microsoft Outlook Personal Folders file (.pst).

On the File menu, point to New, and then click Outlook Data File.
To create a Microsoft Outlook Personal Folders File (.pst) that offers greater storage capacity for items and folders and supports multilingual Unicode data, click OK.
In the File name box, type a name for the file, and then click OK.
In the Name box, type a display name for the .pst folder.
Select any other options you want, and then click OK.
The name of the folder associated with the data file appears in the Folder List. To view the Folder List, on the Go menu, click Folder List. By default, the folder is named Personal Folders.

On the File menu, click Import and Export.
Click Import from another program or file, and then click Next.
Click Personal Folder File (.pst), and then click Next.
In the File to import box, specify the path and file name of the newly created .pst file you want to import.
Follow the remaining instructions in the Import and Export Wizard.