Do I need to deactivate plugins before using the core update option?
In the past one of the upgrade procedures called for deactivating all plugins, but with the core upgrade process released with Version 2.7 you do not need to deactive the plugins. Here’s Ryan Boren’s explanation as to why: During the upgrade, your blog is put in maintenance mode and loading is halted at the beginning of wp-settings.php. Nothing really runs, including plugins. The only thing allowed to run is the DB upgrade, which takes care of making sure plugins are not loaded. You don’t need to deactivate plugins unless you like turning them back on one-by-one after upgrading to isolate any breakage they might cause.