One thing you should all be aware of, this patch fixes a hole in the SMB server which is used for file sharing.
It will not stop someone sending you a malicious email with an exe attached or trying to get you to download & execute a package from some dodgy website.
As I understand it, Wannacry it has two modes of infection, the first is by the owner of the machine activating the virus by running it, so be careful when opening packages from other machines, keep your virus scanners up to date etc... and you should be OK
The second mode is what makes it spread so fast, if an infected machine is connected to a network with unpatched machines on it, it will use the SMB server hole to directly infect those machines and I believe no human interaction is required for this, so if you have guests & allow them access to your WiFi they could infect your machines just by connecting to the local network
This stops a Wannacry infected PC from infecting other PC's via a network connection, it's not a magic bullet to prevent you getting it by other means.
Edited by esme, 16 May 2017 - 05:36 AM.