It means that the server or the person connecting to the server do not have the same game version. If the server is v1.7.2 and the person connecting to the server only has v1.7.0 then they can't talk to each other. Or it can be the other way around. They both have to have the same version of the game.
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An outdated client simply means that your current version of minecraft isn't up to date with Mojang. It's okay to have a outdated client simply because some minecraft servers take longer than others to update with Mojang, that's why all versions of minecraft are available through the minecraft launcher. Some mods require older versions of minecraft as well. The newest version of Minecraft PC that is out right now is 1.10.2. One of the servers I play on is still using 1.9.4 because they have to update their code to support 1.10.2, so I run a 1.9.4 client.
It means that a person can’t connect to a server that is out of date or you being out of date.You can solve this problem by updating your game account.
Client outdated means that the client (the software used to connect to the server) is out of date. You need to update your version of Minecraft.
Simply go into 'edit profile' on the launcher and select which version you want to play in. This should solve the 'outdated client' issue.
Either you don't have the latest minecraft client or the person is using the program session stealer which when someone joins the server it kicks them with the message outdated cleint and takes their il logs onto a specified server your oped the does /op command to gain admin
No you don't you can download it on a outdated minecraft as long as the download you download is the same as the outdated minecraft you choose
It means that you need to login on minecraft.net and download new launcher.