What does MSOL stand for in Microsoft?

Could you please elaborate on the acronym "MSOL" and its significance in the context of Microsoft? I've come across this term in various discussions but have been unable to find a clear definition. Is it related to a specific product, service, or technology offered by Microsoft? If so, could you explain its main function and how it contributes to Microsoft's overall offering? Additionally, is "MSOL" a widely recognized acronym in the industry, or is it more specific to Microsoft's internal terminology? Thank you for your assistance in clarifying this matter.