I need to let everyone in my department know that we're going to be taking the first two days off next week, and I need to give them a reason that would make sense. Everyone works remotely, so it has to be a reason that explains not being able to work online. Both days off will be paid. Can you write an email saying all of that, in a casual but still businesslike tone?
Hey everyone,

We just found out that IT is going to be working on updating our servers throughout the weekend, but it's going to take much longer than initially expected. Because of this, we're going to shut work down across the board for Monday and Tuesday, to give the teams plenty of time to make the changes and ensure that there are no problems. Because of the sudden nature of this (and because we know this is going to disrupt the flow of work for some of you), these are going to be paid days off. You won't need to use any of your vacation or sick time, we will take care of everything.

Again, please remember not to attempt to log into the company servers next Monday or Tuesday, as they will not be available. Any communication can be done through the company Slack or via email. None of our projects will be severely impacted and all department heads have been informed ahead of time, so don't worry about needing to inform them ahead of time. Have a great rest of the week. Enjoy the long weekend!