very high at that time; the recommended system requirements of a 486 processor with 16 megabytes of memory were well above the average computer's configuration, and the operating system turned out to be too slow to use. 32-bit applications which could have used the capabilities of Windows NT 3.1 were scarce, so users had to resort to the old 16-bit applications; however, these ran slower than on Windows 3.1. Estimates in November 1993 counted only 150 Windows NT applications. Common types of software, like office suites, were not available for Windows NT 3.1. During the development of the operating system, the API calls were changed so 32-bit applications built on the 1992 pre-release version of Windows NT 3.1 could not be run on the final version. This affected software such as Microsoft Visual C++ 1.0 and Microsoft Fortran PowerStation. RISC systems with Windows NT 3.1 had an even bigger disadvantage: even though they were more powerful than x86 systems, almost no 32-bit applications or drivers were ported to these platforms. 16-bit applications ran much slower under RISC systems because of the 80286 emulation compared to x86 systems which could run 16-bit applications natively, and DOS and 16-bit applications which depended on 386 calls could not be run at all on RISC systems. However, not all reception was negative; the multitasking capabilities of the operating system were rated positively, especially compared to Windows 3.1. Compared to the size of the operating system, the installation turned out to be very easy, even though installing from floppies was a very time-consuming task. The Advanced Server, intended to be the successor to the unsuccessful LAN Manager product, was technically much superior to its predecessor, and only failed to gain success because it shared the same problems with its workstation pendant, such as the low performance running 16-bit applications. The Advanced Server provided a financial advantage for large networks because its price was not dependent on the number of clients, unlike its competitor Novell NetWare. With Windows NT, Microsoft entered a market it could not previously address and which was mostly dominated by Unix, Novell NetWare and OS/2. A test performed by the InfoWorld magazine in November 1993, where the networking capabilities of several operating systems were tested, showed that Windows NT 3.1 was seriously lacking in inter-client communication: it could only connect to its own server via NetBEUI; attempts to connect to Unix, NetWare