LotusNotes is primarily a MUA (Mail User Agent). Meaning: It's primarily an application which people use to read e-mail. Created by Lotus Software, now owned by IBM. Lotus Notes also includes functionality for group collaborations, usually known as "Notes Databases". These quasi databases are non-relational in structure, and just serve as common repositories for multiple users to share doucumentation and/or fill out similar forms. Notes Databases are not quite as handy as WikiWiki's but could serve similar ends, through a more limited (read oppressive) structure of security on each document and text field.

LotusNotes is primarily used by larger corporations due to licensing fee structure. Microsoft's Outlook/ExchangeServer enterprise e-mail solution is probably the largest competitor with Lotus Notes/Domino for corporate e-mail infrastructures.

Sorry to correct you on this one:

Lotus Notes in its core is primarily a pretty powerful document database with collaboration features.

The email functionality is but one _implementation_ of what can be done with Lotus Notes. It certainly also contains a huge group calendar app, document repositories, team project management, ... All of that is implemented on a document centric model with the same set of tools.

You say /pu-TAY-to/, I say /pu-TAH-to/...

LN is definitely more than an MUA; however, when you walk around the cube farms at big companies and watch how LN is used, it's an MUA. Occationally, you'll see specialized databases (which are/were just flat files with no relations) and workflow management. However, I have yet to see an "application" in LN that couldn't just as easily if not better managed with a Wiki.