If you want to recover a few items that were accidentally deleted or changed, open the file and then move or copy the items from the backup file into your original file.
On the File menu, point to Open, and then click Outlook Data File.
Click the .pst file you want to open, 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.
Close the backup file by right-clicking it, and then click Close.
If you want to recover a large number of items or an entire folder, import the backup copy of the file. If you don't need to replace the entire folder, you can filter items to obtain the ones you want. Or you can import the entire folder and specify whether or not to replace duplicate items.
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.
If you can't remember where you saved the backup
On the View menu, click Folder List.
Right-click the top-level folder of the .pst file that you want to determine the location for.
On the shortcut menu, click Properties for , and then click Advanced. The location information will be displayed in the Path box.
If you get the error message: "The Personal Folders file (.pst) could not be opened. The file may not be compatible with this version of Outlook or it may be corrupted."
Try opening the .pst file from the Outlook File menu. If you get the error message "The file is not compatible with this version of the Personal Folders information service. Contact your administrator." then the .pst file contains Unicode information. Unicode information is supported by Microsoft Office Outlook 2003 and later. If you are using an earlier version of Outlook, the file will not be accessible. If you get an error message saying the file is not readable or is corrupted, try using the Outlook Inbox Repair tool.
Choose one of the following:
Replace duplicates with items imported Existing data will be overwritten with the information in the file being imported.
Allow duplicates to be created Existing data will not be overwritten, and duplicates will be added to the current Outlook folder.
Do not import duplicate items Existing data will be kept, and the duplicate information in the file will not be copied to the current Outlook folder.
Follow the remaining instructions in the Import and Export Wizard.
If you want to recover your entire .pst file, exit Outlook and use the Windows Find command to locate and rename your damaged .pst file. Make a copy of your backup .pst file, and then give that copy the name of your damaged original .pst file. This file needs to be in the same folder as the original .pst file. Restart Outlook.
http://office.microsoft.com/en-au/outlook/HA100758021033.aspx
