You might sometimes need to send messages to users who are currently logged in to a vCenter Server system. For example, if you need to perform maintenance on a desktop, you can ask the user to log out temporarily, or warn them of a future interruption of service.
- In the vSphere Web Client, navigate to the vCenter Server instance.
- Select the Manage tab.
- Under Settings, select Message of the Day, and click Edit.
- Type the Message of the Day, and click OK.
A warning appears at the top of the vSphere Web Client in every active user session advising users to read the Message of the Day that is set in the relevant vCenter Server system.