| Subject | English | Czech |
| comp., MS | add-on | rozšíření (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| comp., MS | add-on device | rozšiřující karta (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| comp., MS | add-on package | rozšiřující balíček (An XML file in the addons folder of the Datastore. Add-on packages are used to deploy files or an application to a device or emulator) |
| comp., MS | Mail Migration add-on | doplněk Mail Migration (A tool that allows users to upload email messages, email folders, and contacts from an email account on their PC to the cloud to facilitate access from multiple devices) |
| comp., MS | Microsoft Online Services Sign-In Add-On | doplněk pomocníka pro přihlášení ke službám Microsoft Online Services (A required update for Microsoft Online Services that updates the Microsoft Online Services ID Sign-In Assistant to work with other Office programs) |