Actually, using obsolete software (or any kind of tool, for that matter) introduces a security issue of a different sort: the Bus Vulnerability. If the only person who knows how to use your obsolete tool is hit by a bus, (or otherwise dies, or retires, or quits, or suffers Early Onset Alzheimers, or...) the effect is similar to being hacked. You wind up having to replace the tool with something else simply because you no longer have anyone who knows how to use it.
Conversely, the greatest SOURCE of security is documentation. The more documentation you have about your system, the more secure it is simply because it is easier for someone new to come along and fix whatever breaks. Older software MAY have better documentation (especially documented vulnerabilities and fixes), but not necessarily.
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Conversely, the greatest SOURCE of security is documentation. The more documentation you have about your system, the more secure it is simply because it is easier for someone new to come along and fix whatever breaks. Older software MAY have better documentation (especially documented vulnerabilities and fixes), but not necessarily.