Because of this, I suggest using the
ToolsBaer Merge PST Tool. When I used this, the outcomes were fantastic. When Outlook PST files are combined, the data structure remains unchanged. It is the most efficient and
safe way to merge Outlook PST data files. The attributes of PST files, including emails, contacts, calendars, and more, are combined by this program. Outlook PST files may be combined without Microsoft Outlook installed. Windows OS versions 11, 10, 8.1, 8, 7, XP, and so forth are supported. Supported versions of Microsoft Outlook include 2021, 2019, 2016, 2013, 2010, 2009, 2003, and 2000. You may also try this service for free with its trial version.