It's a moparscape server that has the new runescape graphics, but it's the old version without the new items (EXAMPLE: Dragon Claws) The 525 client or server is the one with the runescape graphics and dragon claws.
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client-server
Client outdated means that the client (the software used to connect to the server) is out of date.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.
Most servers that have updated to 508 can't have items duped unless obtained by server owner or they are a server owner otherwise.
Not unless you have a minecraft client in beta.
Well There is no actual minecraft server client to make morecreeps & weirdos online