The university information security office recommends keeping system software up to date as the first basic requirement to protect yourself online.
Users of self-managed machines, particularly laptops and tablets that are used outside the School need to be particularly vigilant. Computing support rarely recommend installing the initial release of new software straight away, e.g. 10.12.0, as there are inevitably problems to be resolved. In the case of Mac OS X we now recommend that users upgrade to macOS Sierra, if possible, for reasons of security. The current release is now 10.12.3
Some older machine models are no longer supported so please do check the requirements online. If you believe that your hardware or application software is not compatible with Sierra and that you need to stick with an older version then please check the security fixes for your operating system are up to date.
Recent updates to Sierra, as well as Yosemite and El Capitan provide important security fixes for browser vulnerabilities, noted in this security advisory.
We have put some initial information about Sierra on the computing help website at macos-releases .
Please remember there is a local mailing list firstname.lastname@example.org, which is a very low traffic list for self-support amongst Informatics Apple users. To subscribe visit http://lists.inf.ed.ac.uk/mailman/listinfo/mac-users .