Restore items in a data file

On the File menu, point to Open, and then click Outlook Data File.
Click the .pst file 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 will be called Personal Folders.
Move or copy items in the folder that you opened to the folder you want to restore items to.
To close the data file folder, right-click it and click Close "Folder Name" on the shortcut menu.

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 .pst file you want to import.
Choose one of the following:
- Replace duplicates with items imported. If any existing data in the folder that you are importing to duplicates information in the .pst file, it will be overwritten with the information in the .pst file.
- Allow duplicate items to be created. Existing data in the folder you are importing to will not be overwritten with the information in the .pst file but will be kept instead.
- Do not import duplicate items. Existing data in the folder you are importing to will be kept, and any duplicate information in the .pst file will not be copied to the folder.
Follow the remaining instructions in the Import and Export Wizard. Microsoft Outlook copies the items from the .pst into the folder you specify.