You can use Outlook 2007 and newer to merge PST files. This process is useful if you have acquired somebody else’s mailbox export, or have numerous archive files that are difficult to deal with. You can not select a source PST that is in use by Outlook so you must close it first. If you are consolidating into a single new PST file, create it before you continue with the steps below. The target PST file needs to be mounted in the Outlook profile or it will not show up as an option in the import dialog.
- Open Outlook, right click on the Source PST file and close it
- Click File -> Open / Export
- Click Import / Export
- Click Import from another program or file -> Next
- Click Outlook Data File (.pst) -> Next
- Browse to and select the source PST file (the one you are moving data from)
- Make sure the “Do not import duplicates” option is selected.
- Click Next
- Be sure the “Include subfolders” check box is selected.
- Select the radio button labeled “Import items into the same folder in:”
- Choose the Target Outlook Data File from the drop down menu.
- Click Finish
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