Partners Email Work, this weekend (8/1 - 8/2)

We received the following notice from John Grieco at Partners about email work that will have some (unknown) affect on email this weekend
We wanted to notify this group of scheduled work we are doing with the PHS Email System starting on 8PM on Friday August 1, 2014 and ending on 12:00PM on Saturday August 2, 2014.  We are installing Service Pack 3 for the Exchange 2010 Server Email Platform.  We have discussed this work for many weeks in the change advisory board.  As part of this upgrade we need to restart servers that our users leverage to connect to their mailbox.  The servers are called CAS servers (Client Access Servers). When we reboot the servers the users on that server will get disconnected and will then get reconnected to another server that will get them to their mailbox.  We have planned these reboots accordingly to minimize any user impact.  We have advised the help desk of this work if they are to receive calls during this timeframe.