There are several ways to consolidate multiple PST files. If you only have one or two relatively small files, Outlook’s built-in import and copy options can be used. You can create a new PST and then import or copy the required folders and mailbox items from the other files. However, this manual process can take a lot of time if you have several PST files containing emails, contacts, calendars, and attachments. In that situation, a dedicated PST merging application can be more convenient. SysTools PST Merge Tool can be considered when the objective is to combine data from multiple PST files into one consolidated PST.