Application Packaging Best Practices: Clean, Repeatable, Secure 

There is a significant difference between simply installing software and properly packaging an application. A well-crafted application package installs silently, uninstalls cleanly, respects the user environment, and avoids conflicts with other applications or system components. In managed environments using tools such as Microsoft Intune, ConfigMgr, or virtual desktop infrastructures like Azure Virtual Desktop (AVD) and Citrix, poor packaging often results in performance degradation, login delays, and deployment failures. 

This article outlines best practices to ensure application packaging is robust, maintainable, and scalable.

Begin packaging from a clean, controlled environment 

Application packaging should always be performed within a dedicated packaging virtual machine (VM). This environment must be isolated from production endpoints and free of antivirus or endpoint management agents that can interfere with packaging accuracy. The packaging VM should mirror the production environment’s baseline image, including matching operating system version, patch levels, language packs, and configuration. 

Using snapshots or checkpoints before and after packaging facilitates rollback, comparison, and troubleshooting when needed. Packaging on production or general-purpose workstations is discouraged, as it risks introducing hidden dependencies and inconsistencies. 

Understand installer types and adapt accordingly 

Understanding the nature of the application installer is crucial. MSI installers provide structured install and uninstall processes, support transforms, and enable predictable silent deployments, making them preferable when available. EXE-based installers vary widely, often being created with tools such as Inno Setup, NSIS, InstallShield, or proprietary systems. Identifying appropriate silent installation switches, prerequisites, and exit codes is essential, and repackaging into a standardised wrapper using frameworks like the PowerShell App Deployment Toolkit (PSADT) can improve deployment consistency. 

Legacy or complex applications may require tailored packaging approaches due to factors such as embedded runtimes, middleware dependencies, operating system compatibility, or multi-user session constraints typical of virtual desktop environments. Techniques for these applications include scripting custom installation logic, leveraging MSI authoring tools like Advanced Installer or Master Packager, or applying virtualisation and layering strategies to isolate components and minimise conflicts. 

Select tools based on application and environment needs 

No single packaging tool is suitable for every application or deployment scenario. Commonly used tools include: 

• PowerShell App Deployment Toolkit (PSADT): Offers flexible control over installation sequences, user interaction, logging, error handling, and rollback capabilities, and integrates well with both Intune and ConfigMgr deployments. 
• MSI Authoring Tools (e.g., Advanced Installer, InstallShield, Master Packager): Facilitate creation and modification of MSI packages with complex transforms, custom actions, and compatibility adjustments. 
• IntuneWin Packaging Format: Remains the standard for deploying Win32 applications through Intune, allowing packaging of complex installers and scripts. 

In virtualised or multi-session environments such as Citrix or AVD, application layering or containerisation may be employed to improve compatibility and reduce conflicts. While App-V is no longer under active development, it continues to be a viable option in many organisations for isolating legacy applications, provided the appropriate expertise and tooling are applied. 

Tool selection should be driven by application architecture, deployment targets, and organisational requirements, balancing complexity, maintainability, and user experience. 

Avoid embedding frequently updated applications in golden images 

Applications with frequent update cycles—such as browsers (e.g., Chrome), video conferencing tools (e.g., Zoom), or PDF readers (e.g., Adobe Acrobat)—should not be baked directly into base images. Doing so increases image maintenance overhead and complicates patch management. Instead, these applications should be deployed post-imaging using the chosen application management system to maintain agility and reduce reimaging frequency. 

Implement rigorous versioning, logging, quality control, and testing 

Application packages must be version-controlled with clear, consistent naming conventions (e.g., AppName_3.5.1_Intune.ps1), accompanied by detailed changelogs and deployment logs. Utilising logging features of deployment frameworks, such as PSADT’s built-in logs, facilitates troubleshooting and auditability. 

Quality assurance processes should include peer review of packaging against documented standards and formal sign-offs to ensure accuracy and reliability. Escalation procedures must be defined for handling deployment issues efficiently, minimising disruption and expediting resolution. 

Before deployment, packages should undergo comprehensive integration testing in representative environments to verify successful installation, compatibility with existing policies and applications, and expected operational behaviour. Such validation supports staged rollouts and reduces the risk of widespread failures. 

Conclusion 

Adhering to these best practices for application packaging supports the delivery of reliable, maintainable, and secure software deployments. Careful environment preparation, installer understanding, tool selection, modular application layering, and rigorous testing collectively minimise deployment failures, enhance user experience, and streamline operational support in complex enterprise IT environments.