A software licence is required for every copy of a Microsoft product installed on the hard disk of a PC, the software should not be copied to another PC without first purchasing another licence.
Only Microsoft Office Suite (Word, Excel, Powerpoint, etc.) is an exception to this rule (no other applications). You may make a second copy of the Office software and install it on either a laptop or desktop computer for the exclusive use of the person who is the primary user of the first copy of the software. This is for work-related purposes only. Work at Home copies are licensed separately from the corresponding copies run on "At Work Computers" and must be installed using official Microsoft work-at-home versions. Alternatively use the free and licensed version, Nexus365, on up to 5 different machines.