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I wanted to know whether a particular OS tends to be more likely running outdated* tor releases than another. In case others are interested as well, here is the answer.

OSX, OpenBSD and Windows are more likely running outdated tor releases than FreeBSD or Linux. Probably not really surprising..

A more detailed answer: (ordered from bad to better)

| OS | outdated_fraction | outdated relays | outdated_cw_fraction | +--------+-------------------+-----------------+----------------------+ | Darwin | 24.6154 | 16 | 0.03 | | NetBSD | 22.2222 | 2 | 0.00 | | OpenBSD| 21.8750 | 14 | 0.05 | | Windows| 17.2189 | 291 | 0.01 | | FreeBSD| 9.1743 | 20 | 0.15 | | Linux | 8.8392 | 597 | 4.29 |

(based on onionoo data from 2015-03-27)

If you are missing an OS (like SunOS) in the list, than this means that it does not run any outdated release at all (outdated_fraction=0%).

*) actually it is about whether the relay uses a recommended version as defined by dir auths https://consensus-health.torproject.org/#recommendedversions I "added" tor 0.2.7.x to the list to avoid flagging bleeding edge relays as outdated.