I think most people have an archiving regimen in which mail and calendar items more than six months old get filed off from the outlook.pst into their archive.pst.

I would like merge all my calendar items from my archive.pst back into my outlook.pst, so I can have a complete historical calendar when I sync outlook to my iPhone.

This isn't the same as merging two outlook.pst files ... or is it?

See screenshot. Thanks.

2018-04-13_8-53-49.png

If you choose a list view in outlook (under view) liek the "by category" view, and you select all items in your archive calendar (ctrl-A) then do ctrl-c to copy, go to your normal calendar and do ctrl-v it should copy everything to the actual calendar.

regards,
john