The phrase "a message box" is correct and usable in written English.
It can be used in contexts related to computer interfaces, software applications, or any situation where information is displayed in a dialog box format.
Example: "When you click the submit button, a message box will appear to confirm your action."
Alternatives: "dialog box" or "notification box".
When I boot up my computer, I get a message box that says, "Incorrect version of MAPI32.dll".
There's a "message box" on the Cotswold Way where you can leave comments for other walkers, plus an elevated "vicar's path" in Dyrham.
"We have a message box on our fence out there at the house and we check it daily when we're up there and the messages are from Norway, Denmark, Sweden, Wales, Ireland, Japan, Germany.
A message box pops up asking you, "Do you want to change your search engine to Bing?" (Yahoo, the other search options, is using the same notification).
When manual operation is needed in the matching process, the thumbnail images, names and meanings of the symbols that completely matched the converted symbol can be quickly and accurately obtained and displayed in a message box by querying the corresponding symbol table according to the appropriate standard (Fig. 4).
When the user clicks on the command button the local language translation pops up in a message box.
Any user can assign another user a task by typing it into a task message box or post a note to the message board.
What they found is that if they simply put up a blank message box for asking a friend to take down a picture, only 20% of the people will fill out the dialog box to send a message to a friend.
The default home screen has a status update widget along with a "Universal Message" box that shows all of your new emails.
Click the "Run" among the optional list,then a "Run" message box will pop out immediately.
There will be a yellow message box alerting you that your message has been sent, and giving you the option to click "Undo" or "View Message".
