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title: Frequently asked questions
summary: Frequently asked questions for Business Central cover AppSource app publishing, testing, updating and validation, AL development, library apps, migrating to Business Central online, and the Windows client deprecation. It answers practical how-and-why questions for partners, developers and admins.
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---

# Frequently asked questions

> Frequently asked questions for Business Central cover AppSource app publishing, testing, updating and validation, AL development, library apps, migrating to Business Central online, and the Windows client deprecation. It answers practical how-and-why questions for partners, developers and admins.

Path: [Get started](../get-started.md) > Frequently asked questions · tier official · system none · narrative reviewed (checked by Opus)

## Overview

This section is a set of FAQ pages with no subtopics. Most pages target partners and developers who build and publish apps to the Marketplace: submitting and managing an offer, testing, updating apps, marketing validation, library and dependency apps, and the app and extension lifecycle.

Other pages cover a general FAQ for developing in AL, questions about migrating to Business Central online, and the discontinuation of the Windows client.

Start with the page that matches your task. For a first Marketplace release, read the offer submission FAQ, then the testing and marketing validation FAQs. For later releases, use the updating and lifecycle FAQs. For moving from on-premises to the cloud, use the migration FAQ.

## Key points

- Library apps hold shared code for multiple Marketplace apps and are installed automatically as dependencies.
- Offer management FAQ covers the Partner Center flow: Review and publish, the Go Live button, validation queuing and technical validation.
- Testing FAQ describes expected coverage: online-only testing, version testing, country testing, upgrade testing, automated and manual tests, and Docker.
- Update FAQs cover version numbering, preserving app identity, compatibility configuration, automatic updates, admin center management and the hotfix process.
- Lifecycle FAQ covers upgrade codeunits, code signing, force updates during major releases and recommended update frequency.
- Marketing validation FAQ requires statements on supported editions, countries/regions and languages, plus help pages, product naming and marketplace badge rules.
- Migration FAQ covers system requirements, data limits, SQL connection strings, self-hosted integration runtime, the intelligent cloud permission set, data compression and replication.
- Windows client FAQ explains the move to web, mobile and Windows 10 desktop clients starting with 2019 release wave 2 in October 2019.

## Learn pages

- [FAQ about Library & Dependency Apps in Business Central](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/app-faq-dependencies-libraries): Get answers to some of your questions about library apps and dependency apps in Dynamics 365 Business Central
- [FAQ about managing and submitting your Business Central offer](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/app-faq-offer): Get answers to some of your questions about managing an offer in Partner Center when you build an app for Dynamics 365 Business Central
- [FAQ about Migrating to Business Central Online](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/administration/faq-migrate-data): Get answers to frequently asked questions about migrating to Business Central online from on-premises solutions, including supported versions and data limits.
- [FAQ about Testing your Business Central App](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/app-faq-test): Get answers to some of your questions about testing when you build an app for Dynamics 365 Business Central
- [FAQ about Updating your Business Central App](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/app-faq-update): Get answers to some of your questions about updating your app for Dynamics 365 Business Central
- [FAQ about Windows Client and Business Central](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/faq-win-cli): Get answers to why the Windows client is no longer supported with Business Central.
- [FAQ for Developing in AL](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/devenv-dev-faq): Overview of frequently asked questions for development using the AL language.
- [Lifecycle of apps and extensions FAQ](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/devenv-update-app-life-cycle-faq): Overview of the frequently asked questions about updating an app on Marketplace.
- [Marketing validation FAQ](https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/readiness/readiness-marketing-validation-faq): The marketing validation FAQ for Business Central apps

Source: Microsoft Learn (CC BY 4.0). Descriptions are Learn's own.