1. On the File menu, click Import and Export.

2. Click Export to a file, and then click Next.

3. In the list, click Personal Folder File (.pst), and then click Next.

4. Click the folder that contains the messages you want to back up. If the folder contains a subfolder that you want to include, select the Include Subfolders check box, and then click Next.

5. Under Save exported file as, click Browse, and then specify a name and location for your backup file, for example, Mail Backup.

6.
If you back up a .pst file
that you have backed up to before, click one of the following:
Replace duplicates with items exported Existing data will be overwritten with the
information in the file being exported.
Allow duplicate items to be created Existing
data will not be overwritten, and duplicate information will be added to the
backup file.
Do not export duplicate items Existing
data will be kept, and the duplicate information in the folder will not be
copied to the backup file.
7.
Click Finish.
