Outlook 2003 keeps going to a disconnected status

  I recently set-up some news PC that have Outlook 2003 SP1 installed on the PC.  Some of the staffer’s mail boxes keep going to a disconnected or offline state.  They still have access to the internet but outlook becomes disconnected.  Other people are still connected at this time but users who become disconnected; have to do a full shut -down to gain access back to outlook2003.  Everyone here is step up on an exchange server.  This problems does not effect everyone in the office but it does effect the person who becomes disconnected about 3 times a day.
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Sounds like a Cached Exchange mode problem.
DId you install all of the clients yourself? as well as run Outlook for the first time after the install?
When outlook first opens up and the profiles are set, there is a check box for "Chached Exchange Mode" underneath where the server name is input. In order to change this setting to "unchecked" on your troublesome clients you must:
Close Outlook
Open Control Panel
Go to Email Options
Click "Email Accounts" Button
From there go to "View Or Change Existing Email Accounts"
Once there, you will see you Microsoft Exchange Server connection
Highlight it and hit the "Change" button
Uncheck "Use Chached Exchange Mode"
Press next, then finish
Restart Outlook
Problem solved

I am gonig to assume you are running clients on Exchange 5.5 rather than Exchange 2003. This is a common problem with 5.5 as it does not support the Chached mode of operation, so when that is checked, people somehow don't get their email properly.
I hope this helps

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There is some other options you could try here...

See my blog post

( snafder.blogspot.com -> search for Outlook disconnected )

Primary, and likely issue is that your Local Security Logs are full.
See the blog for HOW TO on that one (Computer Management -> Event Viewer -> Security -> Clear All Events)

There are several other possible solutions in the blog too.

One of which was the same as the accepted solution here - except that I don't really recommend that as anything except a final resort.
Mainly because it will use uneccesary bandwidth / processing cycles on your network/Exchange server - and also limit you to accessing your mailbox when the Exchange Server is online and without issue.
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