I am getting very frequent 'not responding' issues when some users are opening / closing office files (usually Excel spreadsheets) which reside in a network share on our SBS 2011 Essentials Server. More than one network share exhibits this problem and I also have a network printer which always takes over ten minutes from putting the print job in the queue to actually starting to print. The server was working fine until a few weeks ago and I am not aware of any thing having changed. It is a 'standard' SBS 2011 Essentials setup with DNS running in the server and DHCP on the gateway router. I am desperately looking for some useful pointers here . Thanks.