Upgrade WPMU to version 1.3
I just upgraded my WPMU from previous 1.2.x to the current 1.3, so far so good, seemed everything is smooth.
Here is the steps I followed:
1. Backup MySQL Database. I finally didn't use the backup data after all since no problem on the upgrade.
2. Decompress the WPMU in a new directory. I didn't touch the old version, so just in case anything went wrong, I can quickly switch it back.
3. Copy wp-config.php and .htaccess from old installation to new one. Copy wp-content directory from old installation. (Notice that old files appeared in wp-content/mu-plugins directory will not required in new version since they have been moved to other place, only copy the plugins you installed in that directory. )
4. Switch apache's virtual host setting and point to new directory.
5. The new installation should already work now, login to the management interface, run "site admin/upgrade", then check if any plugin compatible problem.
I have no problem to upgrade after all.
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