How to tell what version of WordPress you have running

View the source code of any page that WordPress created in a web browser.

This is autogenerated by a php code in your header.php
<# meta name="generator" content="WordPress <#?php bloginfo('version'); ?>
<#!-- leave this for stats -->

Check your Version. You can find the version of WPMU by looking at the page source of any page. If you are viewing the site you should see <meta name=”generator” content=”WordPress 2.5.1″ />, keep in mind the WPMU version is deprecated by 1, so 2.5.1 is really 1.5.1.

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