I have a lotus database in version 4.5. Now i have a new server Lotus Domino in version 5.0.6a and when i try to convert databse with command "Load compact", Lotus Domino crash and a error appear "Panic - out of handle"

How can covert this database?
There are many possibilities for this. Unfortunately, we need more information. I would suggest running the compact with the server down, if you haven't already tried that. If that fails, we would need to see the notes.rip that was generated with the crash.

This was first published in February 2001