Can I make an entry for an outsourcer if my only experience with them is with a test translation?

No. You may have come to some conclusions about an outsourcer based on a test translation, negotiations or other preliminary interactions. However, based on our experiences, we decided that the Blue Board would be provided only for expressing one's likelihood of working *again* for specific outsourcers. In other words, you have to have at least begun a "real world" project for any outsourcer for whom you make an entry.