After I recently upgraded my blog to the latest version of WordPress v2.7, I noticed an Error 500 – Internal server error.
This seems to be a problem for WordPress blogs which are hosted by 1&1
The solution to the Error 500 – Internal Server error
1. Create a file called “php.ini” in the /wp-admin/ directory of your blog
2. In the file add the text “memory = 20MB” without the quotes
This should fix the problem