SwiftFile: Notes Client suggests the Folder to file your Inbox Messages into

SwiftFile is built into the HCL Notes client starting in 11.0.1. It is available as an extra install for all previously supported versions.

There is a nice technical report that has all the features explained in detail:

Abstract

While most e-mail clients allow users to file messages into folders, the process they must go through to file each message is often tedious and slow. For each message, the user must first decide which folder is most appropriate. Then, the user must inform the e-mail reader of that choice by selecting the appropriate icon or menu item from among what is typically a set of several dozen choices. The combined effort of choosing a folder and conveying that choice to the application of-ten discourages users from filing their mail, resulting in unmanageable inboxes that contain hundreds or even thousands of unfiled messages. SwiftFile encourages users to file their mail by simplifying the task. Using an adaptive classifier, it predicts the three folders that are most likely to be appropriate for a given message and provides shortcut buttons that permit the user to effortlessly file it into a predicted folder. For typical users, SwiftFile’s predictions are accurate over 80% to 90% of the time, resulting in a substantial reduction in the time and cognitive burden required to file messages.

Team Mailbox: a mail-in mailbox with one unique sending address for multiple users

Sure, you will need a team mailbox. One single mailbox with one address like Sales@mycompony.com that even a distributed team of people can work with. You can read more about it when browsing the official documentation: Selecting an alternate From address in a shared mail file

Team Calendar: Using a Calendar with a bunch of people simultaneously

It’s groupware – so it’s obvious that it should offer a Team Calendar.
The official documentation about the Team Calendar in HCL Notes has all the details.

E-Mail: Putting a Notes Inbox Message into more than one Folder (without copying it!)

Mat Newman explains this in a YouTube video