Microsoft's volume licensing websites have been offline for over a week while the software giant has been tweaking its service.
Redmond's eOpen licence and volume licensing service sites have been "down for maintenance" since 7 December.
Microsoft apologised to customers affected by the scheduled outage and said it hoped to bring the service back online tomorrow (16 December).
"The Microsoft Volume Licensing Service Center is undergoing maintenance as part of a series of enhancements to improve the licensing management experience for partners and customers," it said. Find out more here.