What does that mean?
This error can seem very strange. You sit there looking at your computer, staring at the screen. NO! I am not logged in somewhere else. I don't even have another computer to open Eudora on. What gives?
The message
If you aren't logged on another computer and running Eudora, then this may be because Eudora terminated unexpectedly last time you used it and left an owner.lok file in your Eudora folder, causing it to display a dialog box titled "Remote Instance" with the message "An instance of Eudora may be running on a remote computer. Accessing a mailbox from two instances of Eudora may lead to data corruption."
There will be 3 options:
1. Exit this instance
2. Terminate remote instance
3. Continue (I'll accept the consequences)
What to do?
Pick the third choice. If that doesn't work, erase the owner.lok file from your Eudora folder.