I went into OO and opened a word document I had on the PC. I tried the
instructions to check the Thesaurus and it was grayed out also.
I went into Snaptic Package Manager and did a search for: "Thesaurus-en-usa"
Well I tried to search but it filled up the search bar and showed me a
selection
which I installed. It now works, so it didn't get installed by default.
When
installing 10.04 I selected the usa english for language and keyboard.