Soumya
Every One provided you the best answers. Answer to your question is based on the basics of every word posted by each one. Kindly read them with patience.
To add some more points
The open architecture of the Windows operating system offers many advantages over UNIX, the most dramatic being cost savings and ease of maintenance.
Potential Benefits
Provides a comprehensive assessment and baseline of your IT infrastructures, making it possible to rapidly move forward with planning and implementation
Can significantly improve efficiency, scalability, and availability of your IT infrastructure
Helps reduce your dependency on complex and often expensive proprietary systems
Provides project management expertise from start-to-finish to help ensure your expectations are met
Utilizes existing IT systems and applications whenever possible
Minimize disruptions to your flow-of-business and employee productivity
UNIX
The Unix system had a great impact on other operating systems. Unix has been called "the most important operating system you may never use."
Unix had a drastically simplified file model compared to many contemporary operating systems, treating all kinds of files as simple byte arrays.
Unix also popularized the hierarchical file system with arbitrarily nested subdirectories, originally introduced by Multics
Unix provided the TCP/IP networking protocol on relatively inexpensive
As a UNIX solution, it allows you to run the applications you want on the hardware you want, scaled to the size you need—bringing you new levels of flexibility and performance. Delivers high levels of security, integration, flexibility, and reliability—essential for meeting the high demands of today's e-business applications.
These points should conclude your doubt.
Vinod
