If you have not used SimpleTags before you don't need to read this file.

In case you had any of SimpleTags 1.x versions installed and you want to upgrade to 2.x, 
you will have to run the following database update from phpMyAdmin:

update wp_posts set post_content = REPLACE(post_content, "<tags>", "[tags]");
update wp_posts set post_content = REPLACE(post_content, "</tags>", "[/tags]");
update wp_posts set post_content = REPLACE(post_content, "<tag>", "[tag]");
update wp_posts set post_content = REPLACE(post_content, "</tag>", "[/tag]");

Note that wp_posts is the default table name for posts. If your posts table has a 
different prefix, you have to change "wp_posts" to the table name you're using.

Although this is a very simple update, it is recommended that you backup your tables 
before performing an upgrade.