You can read the Path value from
HKLM\Software\Microsoft\Windows\CurrentVersion\App Paths\OUTLOOK.EXE and see
where Outlook is installed if it is and then go to that folder and file and
read the version property. A clue usually is the 11.0 in the path for
Outlook 2003 or 12.0 for Outlook 2007, etc. but the user can install where
they want so that's not always accurate.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Absolute Beginner's Guide to Microsoft Office Outlook 2003
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Tanweer Ahmad" wrote in message
...
Hi Experts,
I am developing an outlook plugin for office 2000,2003,2007. i want to
make a setup file which can check the installed office version and install
the relative PIA, before installing the addin.. how can i do that?
Peace & Kind Regards,
Tanweer