It doesn’t happen too often that I come across an error that I haven’t seen before.

Customer is running Exchange 2003 on a native 2003 server infrastructure. Users would log into the webmail area but when they’d click on any emails to read the nasty 507 error would show up. Another issue was that webmail was up-to-date but the local outlook client was not. Local client would say it was connected to Exchange, but would not actively update folders. Forced updates yielded no results.

A quick check of the eventlog showed this:

Source: MSExchangeIS
Category: Performance
Event ID: 9582
Description: The virtual memory necessary to run your Exchange server is fragmented in such a way that normal operation may begin to fail. It is highly recommended that you restart all Exchange services to correct this issue.

Well that’s an easy fix. I shut down the services:
IMAP4
Management
MTA Stacks
POP3
Routing Engine
Information Store
System Attendant

And then started them back up in the reverse order. Everything checked out OK. Now to get them to upgrade to Exchange 07/10…