| Subject | English | Welsh |
| comp., MS | confirmation message | neges cadarnhau (An alert that is shown to prompt the user to agree to the action being taken) |
| comp., MS | e-mail message | neges e-bost (A message that is sent over a communications network such as a local area network or the Internet) |
| comp., MS | email message | neges e-bost (A message that is sent over a communications network such as a local area network or the Internet) |
| comp., MS | incoming message | neges i mewn (A message that has been sent across one or more messaging systems. It may have been sent only to you or to many other recipients. Incoming messages are placed in a receive folder designated to hold messages of a particular class. You can set up a different receive folder for each message class that you handle or use one folder for all of the classes) |
| comp., MS | instant message | neges wib (A message sent in real time through a network to a private chat area) |
| comp., MS | instant message | gwibnegeseua (To send an instant message) |
| comp., MS | Internet Message Access Protocol | Protocol Mynediad Negeseuon Rhyngrwyd (A method computers use to send and receive e-mail messages. It allows you to access e-mail without downloading it to your computer) |
| comp., MS | message bar | bar negeseuon (A user-interface element that contains information about actions that you recently performed in a list. You can double click on the message bar to get more information about a specific action that you performed) |
| comp., MS | message body | corff neges (The content that is delivered in an e-mail message) |
| comp., MS | message class | dosbarth neges (Used by Microsoft Exchange to identify, locate, and open a form) |
| comp., MS | message header | pennawd neges (A hidden section of an e-mail message. From the time a message is first created, information about it is added to the message header, including technical details, such as who created the message and the software used to compose it) |
| comp., MS | message item | eitem neges (An implementation of the Internet Message Format defined by RFC2822. A message item is stored in the Exchange store) |
| comp., MS | message list | rhestr negeseuon (The middle part of the main Outlook window that displays the contents of the selected folder) |
| comp., MS | message transfer envelope | amlen trosglwyddo neges (A MAPI message that holds the delivery information for a message) |
| comp., MS | message transfer system | system trosglwyddo neges (The X.400 term for a messaging system, which is a product that enables electronic communication over a network) |
| comp., MS | notification message | neges hysbysu (An e-mail message that is sent by a notification activity) |
| comp., MS | offline instant message | neges frys heb gysylltu (An instant message that is transmitted while the sender or recipient is offline) |
| comp., MS | quota message | neges cwota (An e-mail message that is automatically sent by Microsoft Exchange to the owners of a mailbox or a public folder when a size limit, which is called a storage quota, for the mailbox or public folder has been exceeded or is at risk of being exceeded) |
| comp., MS | text message | neges destun (A short alphanumeric message that is sent between mobile phones or devices using the SMS protocol) |
| comp., MS | video message | neges fideo (A short video sent as an email message to someone in the contact list) |
| comp., MS | voice message | neges llais (An electronic message with a primary content of digitized audio) |
| comp., MS | warning message | neges rhybudd (A message that appears on the screen to alert the user to something that must not be addressed) |
| comp., MS | Windows Messaging | Windows Negeseua (An app that facilitates SMS and instant messaging) |