Just to check, what have you tried? Also, where is the archive PST stored
(local hard drive, CD/DVD, network drive)?
You could open the archive PST file and drag/drop items from there into your
main Calendar folder. You could also try importing using the File menu >
Import & Export command.
>I archived older items in my Outlook Calendar and now I want to merge that
> data back into my active calendar. I have tried a bunch of things withour
> success.