Notes/Domino 4 and 5 Forum

Is it possible to work with databases version 6 with a Notes client version 5 ?

I can open documents but sometimes i have crashes : "an application error has occured in nlnotes.exe" or "lookup handle: null handle"
and i lose my work at each time.

i can't upgrade my client now but i have to work with v6 Notes databases.

thank you