An oldie but I see it coming up in the newsgroups...my guess is that some sysadmins forgot to fix the problem and the users (specifically home users) trying to access their mailboxes are surprised and convinced that something is wrong with their own system...
Why not you ask? Well since it may be painfull... Microsoft released a patch for Exchange 2003(888619). I read the documentation and it seemed to be relatively harmless...so I decided to apply it to my environment. http://support.microsoft.com/?kbid=888619...
Now what exactly does that mean... http://support.microsoft.com/default.aspx?scid=kb;en-us;883479
When a mailbox is over quota and it can not send messages, out of office messages for the will still be sent.
Ok, So here I go again with my shameless self promotion-I have published my second article at MSEXCHANGE.ORG. Here is a direct link to it: http://www.msexchange.org/articles/Exchange-Databases-Disk-Consumption.html Hope you enjoy it.