Many businesses have a slow period over Christmas New Year, when they run only a skeleton staff.  You can make use of this time to have some work done on the network that would normally be done at after-hour rates. 

Every server benefits from having its services shutdown and the hard drives defragged.   We often defragment them during the working week, but it isn't as effective as possible if the server is being used at the time and files are open.  A quiet time like the Christmas period is a unique opportunity to overcome this,when the server isn't in use and a defragmentation can be as thorough as possible.   It means you can start the New Year with a optimal disk layout, with your server as primed as possible for the year ahead.

There are similar actions which apply to PCs.  Normally its hard to get access to enough office PCs at once to make this an efficient process.  Again, the Christmas New Year period is a unique opportunity to get these things done without disruption.   

Just like your car, an annual network tune up and service makes sense.  Your Engineer or Account manager can help arrange this for you.