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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