“scheduled to upgrade our systems on Saturday, October 24, from 12:01 am PDT (Saturday, October 24, from 0701 GMT). As a result of this upgrade, all services (Serials Solutions 360 services, Client Center, Ulrich’s, and Summon) may become unavailable. Our work will be completed in 2 hours. After the work is performed IP addresses are spawned across the world by network providers and services will return as networks are updated. Since network providers vary in their responsiveness we wanted to alert you to a worst case outage of 4 additional hours for a total of 6 hours. I believe your window of downtime will be much less, probably 2 to 3 hours total.
I appreciate your patience and understanding.