Choose File, Import And Export to start the Import And Export Wizard.

Click Export To A File, as shown in Figure 20-29, and then click Next.

Figure 20-29. To back up calendar items, start the Import And Export Wizard, and then select Export To A File.

On the Export To A File page, shown in Figure 20-30, select Personal Folder File (.pst), and then click Next.

Figure 20-30. Calendar items should be backed up to a .pst file.

In the Export Personal Folders dialog box, select the folder to export (the Calendar folder in the example shown in Figure 20-31). If you select the Include Subfolders check box, any subfolders of the selected folder are exported as well.

Figure 20-31. You use the Export Personal Folders dialog box to specify the folder to export to a file.

Click Filter to open the Filter dialog box, in which you can specify the items to be exported. You can use the Filter dialog box if you want to export only specific items from your Calendar folder. If you choose not to use the Filter dialog box, all items will be exported. Click Next to continue.

Specify the exported file and the export options. The export options control how Outlook 2007 handles items that have duplicates in the target file. You can choose to overwrite duplicates, create duplicates in the file, or not export duplicate items.

Click Finish. The Create Microsoft Personal Folders dialog box, shown in Figure 20-32, displays the selected file name.

Figure 20-32. Type a password and verify the password before creating the .pst file.

Specify a descriptive name for the .pst file. You can also set a password for the file.

Click OK to create the file.

Choose File, Import And Export to start the Import And Export Wizard.

Select Import From Another Program Or File, and then click Next.

Select Personal Folder File (.pst), and then click Next.

On the Import Personal Folders page, specify the backup file and how Outlook 2007 should handle duplicate items. You can choose to overwrite duplicates, create duplicate items, or not import duplicates. Then click Next. If you assigned a password to the backup file, you will be prompted to enter it at this point.

Select the folder within the .pst file to be imported (the Calendar folder in this case), decide whether to include subfolders, and select the target folder. (By default, the target folder is the folder with the same name in the current mailbox, as shown in Figure 20-33.) You can also click Filter to specify in the Filter dialog box which items are to be imported.

Figure 20-33. When you’re importing items, you must select the folder to be imported from the .pst file, whether to include subfolders, and the target folder.

Click Finish to complete the import process.