Your message appears clear and concise. You've communicated the issue with the MT4 Mobile Server, provided alternative options for users to proceed with their trades using the Desktop Trading Platform and Web Terminal, and offered a channel for further assistance through Live Chat.

Remember to emphasize the availability of the Desktop and Web Terminal to reassure users that they can continue their trading activities without interruption. If there are specific details about the maintenance schedule or any additional information users might need, you can consider including those as well.

If you have any more elements to add or if there are other aspects you'd like assistance with, feel free to let me know!