To anyone trying to get Omeka working with 1and1.com Hosting service. I had to modify the .htaccess files in both the root folder and the admin folder to include these lines:
# added specifically for 1and1.com
AddType x-mapp-php5 .php
AddHandler x-mapp-php5 .php
Those lines force the 1and1 servers to use the PHP5 libraries.
However, I see that 1and1 servers are ignoring the directives in this part of the htaccess file:
php_value display_errors 1
php_flag zlib.output_compression On
php_flag register_globals off
php_value zlib.output_compression_level 5
because the 1and1 servers aren't loading mod_php5.c. I'm not sure what they're loading and I also believe those 'php_' directives are OK to be skipped.
Jason