Migrating exchange calendar entries from company exchange to personal exchange

"You can also drag and drop those calendar entries by opening both calendars so you can see them in a side-by-side view.

Simply hold the control button on the company calendar entry as you drag it over to your personal calendar. If you dont hold the control button you will remove the entry from the company calendar."

You should be able to export just calendar events from one account and then import them into another. I believe you will need to highlight the calendar item when exporting to just get those items.