ocr: FirstClass X Replace Existing Personal Post Office? The existing version of Firstllass already Installed on your computer has a Personal Post Office (PPO) I to store your messages if and when you work offline. You can, if you wish, overwrite your existing PPO with a new blank one. This will erase any messages you have saved in it. Probably the only reason you would wish to do this is if your old PPO has become corrupt and cannot be used. Normally, including It you don't understand this question) you will want to keep your existing PPO. So leave the checkbox below alone, and just press "Next>". ...