You can estimate the popularity of an operating system in a particular region using indirect data - ascertaining the level of interest in an operating system. And you can find out the level of interest if you figure out the number of queries to search engines about a particular operating system. Fortunately, Google provides this kind of information, which the
Pingdom guys used to assess the
popularity of Linux in the world . I came across this idea - an assessment of the popularity of different operating systems - the other day, when I did the translation of the article "
Linux popularity across the globe " and studied the
popularity of BSD systems .
Windows

The top five countries by degree of interest in
Windows (the full list can be found
here ):
- India
- Sri Lanka
- Cuba
- Russia
- Pakistan
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Linux

The top five countries in terms of interest in
Linux (the full list can be found
here ):
- India
- Cuba
- Russia
- Czech
- Indonesia and Bangladesh
BSD

The top five countries in terms of
BSD interest (the full list can be found
here ):
- Indonesia
- Russia
- Moldova
- Estonia
- Czech
Solaris

The top five countries in terms of interest in
Solaris (the full list can be found
here ):
- India
- Singapore
- Japan
- Sri Lanka
- Bangladesh
Netware

The top five countries in terms of interest in
NetWare (see the full list
here ):
- Belarus
- Russia
- South Africa
- Indrnesia
- Jamaica and India
QNX

The top five countries in terms of interest in
QNX (see the full list
here ):
- Russia
- Ukraine
- Belarus
- South Korea
- India
ReactOS

The top five countries by degree of interest in
ReactOS (the full list can be found
here ):
- Russia
- Indonesia
- Estonia
- Czech
- Ukraine
UNIX

The top five countries by degree of interest in
UNIX (the full list can be found
here ):
- India
- Singapore
- Japan
- Hong Kong
- Kenya
AmigaOS

The top five countries by degree of interest in
AmigaOS (the full list can be found
here ):
- Norway
- Sweden
- Poland
- Finland
- Italy
Plan 9

The first five countries in terms of interest in
Plan 9 (the full list can be found
here ):
- Russia
- Ukraine
- Czech
- Japan
- Sweden
Minix

The top five countries by degree of interest in
Minix (the full list can be found
here ):
- Greece
- Costa Rica
- Russia
- India
- Indonesia
MULTICS

First five countries according to the degree of interest in
MULTICS (the full list can be found
here ):
- Mexico
- India
- USA
- Brazil
- Japan
Aix

The top five countries in terms of interest in
AIX (the full list can be found
here ):
- France
- India
- South Korea
- Senegal
- Hong Kong
HP-UX

The top five countries in terms of interest in
HP-UX (the full list can be found
here ):
- South Korea
- Singapore
- India
- Kazakhstan
- Japan
IRIX

The top five countries in terms of interest in
IRIX (the full list can be found
here ):
- Czech
- India
- South Korea
- Greece
- Norway
Mac os x

The top five countries by degree of interest in
Mac OS X (the full list can be found
here ):
- Switzerland
- USA
- Russia
- Canada
- Australia
System v

The top five countries in terms of interest in
System V (the full list can be found
here ):
- Slovakia
- Czech
- India
- Pakistan
- Slovenia
Tru64

The top five countries in terms of interest in
Tru64 (the full list can be found
here ):
- South Korea
- Singapore
- India
- Switzerland
- South Africa
OS / 2

The top five countries by degree of interest in
OS / 2 (the full list can be found
here ):
- Belarus
- Russia
- Dominicana
- Ecuador
- Ukraine
OpenVMS

The top five countries in terms of interest in
OpenVMS (the full list can be found
here ):
- Singapore
- Czech
- India
- Slovenia
- Sweden