Servers: Windows 2003 Standard / Exchange 2003 Standard with10 users, service pack 2.
Clients: XP Pro and Outlook 2003 fully patched.
Email Environment: Each network user has their own MAPI email account as well as access to a shared email account. The shared email account is very organized with 50-60 customer folders and sub-folders. The inbox, deleted, and outbox is kept clean. The current size of the main shared email account is 13GB. By the way, Exchange has been expanded to accept the 75GB limit. In addition to the main shared email account, the owner has full access to the email accounts of all users (i.e. all users inboxes, outboxes, etc...)
The Problem: Everything was working pretty well for the past few years, but getting a little slow with the older servers. About 4 months ago I upgraded the hardware--New fileserver, exchange server, and vpn server, gigabit LAN -- actually its overkill for their small environment.
Recently I discovered that users are not able to open "certain" email messages on shared email accounts. Some of the problem messages were brought over from the old Exchange server and some are as recent as a few weeks ago. When trying to open the email, Outlook pops up the message "Can't Open This Item. Unknown Error." However, if I go to a workstation, login as the owner of the shared email account, I can read the message. If I forward the problem message, the recipient can open it fine.
The owner who has access to everyone's email accounts is having the same trouble. Random messages are non-accessible when viewed through a shared account. When I say random, I don't mean that sometimes you can open the message and other times you can't. I mean that certain messages seem to be corrupt in this manner while others are not. Furthermore, it doesn't seem to matter who the message was originated from, content, attachments, or even the size of the shared email account (most users accounts are less than 2 MB)
Also, I am fairly confident this is not a rights issue--mainly because within the same folder, most messages are accessible.
I was hoping the problem was limited to messages prior to the upgrade, but unfortunately like I said; I have experienced it with messages as new as 3 weeks ago.
My Event logs are clean.
Please dont' tell me that the one big shared email account is too big--or maybe do--since that would be an easy fix. However, the most evil thing you could suggest is re-install Exchange.
Thanks for reading about my problem and your suggestions.