We are currently running Exch 2000 in mixed mode (still migrating over from Exch 5.5 to Exch 2000). We have migrated 95% of the mailboxes across successfully. We set storage limits on all mailboxes to issue warnings and to prhibit send. Several mailboxes on the Exch 2000 box have exceeded their limits and subsequently been unable to send. We have increased the mailbox limits, but it has no immediate effect. It takes up to five hours to update! We have even rebooted the Exch 2000 server but this also had no effect. Any ideas?