Section B.1. Solutions

B.1. Solutions

Solutions for the desktop space work in layers, with solutions at each layer depending on functionality and services from the layer below and providing functionality to the layers above. The key layers of the desktop are shown in Figure B-1.

Figure B-1. Layers of desktop functionality

We see two main migration scenarios:

Migrating users at all three layers simultaneously

In this scenario, we see a Linux distribution and a desktop environment and the productivity applications being replaced simultaneously. This is best accomplished by first doing a pilot among a representative subset of the user base.

Migrating from the top layer down

This scenario involves replacing the browser and Office application suite first, and then migrating the users to a different desktop environment and operating system.

B.1.1. Linux Distribution

A variety of Linux distribution choices are available for enterprise-wide deployment. The more cutting-edge distributions provide a lower level of support. But several mainstream options also are available, including Red Hat, Mandriva, SuSE, Debian, and Gentoo. The first three are company-supported distributions that come with the option of purchasing support contracts. The last two are community supported, mostly through mailing lists, forums, and chat rooms. When choosing a distribution, you should apply the following criteria:

Package management

All Linux distributions provide a method of distributing upgrades and updates. Red Hat, for example, provides updates via RPM. This is the single most important criterion when choosing a distribution, as it directly affects how easy (or hard) it will be to maintain the deployment base.

Productization

Some distributions are more polished than others. Depending on the technical skill level of the user base, a more polished distribution might be desirable.

Support

Some Linux distributions are available with company-backed support, and others offer only community-backed support. The system administrator's skill set should determine the level of support needed.

B.1.2. Desktop Environment

Desktop environment refers to the graphical interface where the user does her work. Complete desktop environments consist of a large number of tightly integrated but separate pieces of software. By default, GNOME uses a window manager called Metacity, and KDE uses kwin. The window manager is, of course, the most important part of the desktop. It handles window placement, movement, appearance, and user interaction with all the windows on the desktop. The choice of window manager is probably the most important factor in the success of a Linux migration on desktops.

Several window managers are available that offer a wide spectrum of options in the tradeoff between resource use and functionality. Table B-1 illustrates the point. XFCE4 is a less resource-intensive desktop environment. It is also highly customizable.

Table B-1. Window managers and resource usage

Desktop	Required RAM	Required CPU
XFCE4	128 MB	100 MHz
GNOME 2.x	384 MB	800 MHz
KDE 3.x	512 MB	1 GHz

In examining and evaluating desktop environments, consider the following enterprise-user requirements as paramount:

• Ease and consistency of use. An intuitive, integrated, and consistent experience for the end user is key.

• Ease of migration from Microsoft Windows.

B.1.3. Productivity Software

In examining productivity software, we confine ourselves to word processing, spreadsheet software, and presentation software, since meaningful alternatives to Microsoft Office exist in these three categories. We consider the following as requirements for enterprise users:

• Ease and consistency of use (i.e., an easy and integrated experience; e.g., the ability to create compound document spreadsheets or images embedded in a document)

• Ease of migration from Microsoft Office

• Interoperability with Microsoft Office document formats

Note that open source productivity software such as Open Office is steadily gaining ground on major proprietary platforms such as Microsoft Windows and Mac OS X.

B.1.4. Desktop Database Management

Applications in this category are alternatives to Microsoft Access, Microsoft FoxPro, and Adobe FileMaker. While local applications using a desktop database are fast becoming a rarity in enterprises, we recognize the continuing need for an alternative to Microsoft Access. Most open source productivity suites provide alternatives to Access by providing a usable interface to existing open source database servers such as MySQL or PostgreSQL.

B.1.5. Web Browsers

Applications in this category are alternatives to Microsoft Explorer. The security problems and lack of regular functionality updates in Microsoft Explorer have created an opportunity in this area, and the Mozilla Project has capitalized on it. Mozilla Firefox is a modern, stable, and secure web browser available for all major desktop environments.

B.1.6. Messaging Client

Since messaging is a collaboration tool, we provide a detailed explanation of messaging clients in Appendix D.