Does scanpst report any errors?
What size is your pst?

"Matthew Everist" wrote in message
ink.net...
I am using Outlook 2000 SP-3 and i am having a problem deleting older
emails. It seems that anything that is older than 4 months will not
delete;
I get the message

"The messaging interface has returned an unknown error. If the problem
persists, restart Outlook."

I have tried to run scanpst but it does not fix it.

Any suggestions?

Thanks