You can connect to the extra pst-files via File- Open- Outlook Data
File... and then move its contents to the folder of choice.
Another way to go would be to use the import process but I would recommend
creating a backup of both original pst-files before attempting that.

Duplicates cannot be checked for (reliably) by either process as Outlook
doesn't hold that functionality. You can use a deduplication tool after you
have merged the pst-files when you don't want to sort it out manually. Some
of them are lister here;
http://www.howto-outlook.com/faq/duplicates.htm

--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more

http://www.msoutlook.info/
Real World Questions, Real World Answers

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"Falcon" wrote in message
...
Hi,

I have several PST files. How do I import all of them into Outlook 2007
in
such a way that:

1. They combine.
2. Duplicate emails are deleted?

Thanks.