If the two PST files are small, you can usually combine them manually using Outlook. One common approach is to create a new PST file and copy the required folders and email data from both source PSTs into it. The problem with this method is that it requires several manual steps, particularly when the PSTs contain many folders and subfolders. You also need to be careful about duplicate data and folder organization. For a simpler approach, SysTools PST Merge Tool can be used to combine multiple PST files into one, which can be useful when manual copying becomes inconvenient.
