Proprietary operating systems - How Old Today?

1

IOS_11

1

IOS_12

1

IOS_14

1

IOS_18

1

OS/400

6

IBM_i

6

IOS_13

6

IOS_15

6

IOS_16

6

IOS_17

6

IOS_26

6

Solaris_(operating_system)

6

TvOS_26

6

Windows_10

6

Windows_11