When your permalink structure does not end by a trailing slash (/), all your links look like http://example.com/2009/05. Permalink Trailing Slash Fixer add the missing trailing slash.
If you have a site with the following permalink structure
/%category%/%postname%.html and your permalinks
look like these:
- Single Post:
After activation of the plugin:
- Single Post: not modified.
Upload the Permalink Trailing Slash Fixer plugin to your blog, Activate it.