How many email addresses can Outlook hold in the To, CC & BCC fields individually?

Have you ever wondered just how many email addresses Outlook can hold in each of the To, CC & BCC fields? 

There is a limit to how many you can input in each field and this limit is based on the size of the contacts rather than the actual number of contacts in the field. The size cannot exceed 29 KB. This limit applies when the members of the distribution list are selected from your Contacts folder and entered as full email addresses.

If you receive an email containers greater then 29kb of contacts. Outlook may not display your email and say you are out of memory system resources.