A Microsoft não é legal, receio. Você precisa ter uma licença do Office para cada MACHINE e, em seguida, (se estiver usando serviços de terminal), também precisará de uma CAL do Windows Server e de uma CAL de Serviços de Terminal.
Do site da microsoft sobre licenciamento:
Scenario 1: A customer has 50 Windows-based desktops in a call center and would like to use Microsoft Office on all of these. Two servers running Windows Server Terminal Services support using Microsoft Office on these desktops. The customer needs to acquire 50 Microsoft Office licenses—one for each desktop that accesses Microsoft Office on the servers. Even if a desktop is expected to use Microsoft Office infrequently, the customer still needs to acquire and assign a Microsoft Office license to that desktop. If 20 of these desktops never use Microsoft Office, then the customer only needs to acquire 30 Microsoft Office licenses. In addition, the customer needs TS CALs and Windows CALs for each device or user and one or more Windows Server licenses for each server.
Scenario 2: A customer has 100 Windows-based desktops in a call center and would like to use Microsoft Office on all of them using Terminal Services. The workers who sit at these desktops work in three eight-hour shifts, so the 100 desktops support 300 workers. Whenever a shift change takes place, the current worker closes Microsoft Office and logs off of the server so that a new worker can log on and begin running Microsoft Office. The customer needs to acquire 100 Microsoft Office licenses—one for each desktop from which Microsoft Office is used. Windows Server licenses and Windows and TS CALs are also required. Device-based CALs may be the right option when the users outnumber the devices.
Note: The number of desktops, and not the number of workers, is important to this licensing scenario.
Scenario 3: A customer has 40 Windows-based desktops and 30 employees who use Microsoft Office on all 40 desktops. The customer needs to acquire 40 Microsoft Office licenses. This is consistent with the per-device licensing policy.