I am also having the same problem. I am using ACT ver 11.0 with an old ver of outlook (2003). Outlook 2003 looks for a .dbf database and not the new .dat database format. The only thing I have been able to do is export the ACT info into a .txt file format and then import that info into an Excel spreadsheet. From there you can import it into Outlook. You need to also export the headings from ACT into the text file. If anyone knows of a better way, let me know.
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I'm not sure this answered your specific question, but I hope it helped.
John Purdy ACT! Premium V. 18 Lenovo X220, 16GB, & Office 365, 32bit, 256GB SSD
if act is still looking for a DBF, theres a quick fix for this:
in C:/Windows/system32/ folder you will see four files actext.dll, actab32.dll, act9ext.dll, act9ab32.dll remove the first 2 leave the other 2 then search for and delete extend.dat (which holds Outlook's settings), and restart the machine
