Thank you TE, that worked for getting thru step 1, but at step 2 the converter says,
"Converting posts (this may take some time)...
Successful.
Converting polls... Successful.
Converting poll options... Successful.
Converting poll votes... Successful.
Converting personal messages (step 1)... Successful.
Converting personal messages (step 2)...Duplicate entry '1-1' for key 1"