The MailCollection object is a collection of key-value items. Item values are accessed by a unique case insensitive string key or by position. Note that enumeration return item keys.

IMailCollection dual interface

Name	Description
_NewEnum	Hidden property. Gets the collection enumerator.
Item	Default property. Return item value.
Key	Gets the item key.
Count	Gets the collection item count.

Name	Description
Add	Add an item to the end of the array.
Remove	Remove an item.
RemoveAll	Remove all items.