Exchange System Manager: ID No 80040e19 error

Hello fellows,

We have an Exchanged server 2000 in our company and I’m trying to edit permission on public folders via Exchange System Manager.

When I right click on a folder I get

”
The object is no longer available. Press F5 to refresh the display and then try again.

ID No: 800040e19
Exchange System Manager
”

When I manage to open the property dialog on an object and click client permissions I get:

”
An unexpected error occurred.
ID No: 8000ffff
Exchange System Manager
”

Would anybody have anything to help me?

Thanks!