The public folder error message

I’m using W2k SP4 and Exchange 2000 SP3. When i right click the public folder
in System Manager, I get this error message:

The mail proxy for this folder can not be found. This may due to replication
delays. The mail enabled pages will not be shown.
id no:c1038a21
Exchange System Manager.

I have done /Forestprep and /DomainPrep but still getting the same error.
Anyone can help?