I am importing old mail messages into Outlook 2007 on Windows 7 from Outlook Express on another machine. I have located the old mail store and copied it acrosss. It is a folder with several .dbx files - one for each mail folder from OE. It's about 955Mb.
In Outlook I select File / Import and Export / Import Internet mail and Addresses. Deselect Import Address Book and it shows a folder selection window. I select the folder that contains the .dbx files. The message appears immediately. "The mail folder could not be opened. If another process is using this file, please close it and try again."
I have rebooted, and nothing else is running. Security access for the file looks OK as far as I can tell (I can copy it to a different location, for instance).
Any advice much appreciated