I am on a network and there is a shared calendar amongst a few of us, including myself (my calendar is not the shared calendar; the calendar is shared with me too).  We are now wanting MY calendar to become that 'main' one with all the information on it. Either, I need to know how to move/copy all the entries over to my calendar or to move/copy that whole calendar over.  There have also been categories created by colour and name, so it would be great if they could be copied as well. I do have access to the original computer/Outlook where the main calendar is at present, if it cannot be done by using that shared calendar on my computer/Outlook.

Hi,

By switching your Calendar view to a list view, you can move your calendar items in the same way as that you did for your emails- drag them:

http://www.msoutlook.info/question/29

As for Categories, we could use Group Policy to achieve your goal. Please read the article blow and notice the Assigning Categories to Send Email section:
http://www.slipstick.com/outlook/outlook-categories-and-color-categories

In addition, we may also use some 3rd party add-ins like Category Manager to achieve it. But we need to pay for it.

Regards.

Melon Chen
TechNet Community Support