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Exchange OST Issue

Posted on 2007-03-27
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Last Modified: 2010-04-20
I have a Windows 2003 Server Running 2003 Exchange. Problem seems to be multiple users creating .OST files on their local computer.
I have email disappearing from certain date ranges on each computer (all random) After further investigation I used an OST-PST converter and found the missing email in the OST. I converted the OST to a PST and used Exmerge to import the PST back into Exchange with Dont create duplications....Well You all probably know how that turned out....duplicated calender/contact/and emails that were restored were showing as being sent or received 6 months from now.
It seems to me that the clients are losing connection to the exchange server and working in cache mode. When I open up Outlook from a few of the computers I get the prompt from working in offline mode ect...do you want to connect? I choose connect and then it establishes a connection with Exchange. I have one computer with an OST that is 3.5 gigs. I picked up this converter tool but can not find if there is a limit on size for converting an OST.....I know with Outlook 2003 there is a 2 gig limit with a PST unless you specify that it is bigger before the account is created.

Has anyone ever heard of a similar issue?
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Question by:crwilson12
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by:itsireland
ID: 18802458
Could your virusscanner be deleting files from the database? Possibly set up not to delete virusses from the Exchange data folder. Do you have a backup from the exchange server?

Any events on the Exchange server?

From the top of my head the maximum size for a PST is 2Gb but not sure about this. OST have no maximum but a standard max of 20 GB is set in the registry I believe but you'll find your answer here: http://support.microsoft.com/kb/832925.


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by:crwilson12
ID: 18807725
Im not really trying to configure the size for the ost or pst....I knew there was a way to do it. It is a bit of a moot point to configure the size now. I have a 3.5 gig ost file. My issue is the users all creating the ost files and why it is happening.
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itsireland earned 500 total points
ID: 18808385
An ost file contains a copy of all the emails stored in the mailbox on the server and is automatically created when you enable Caching. The OST is the cache. The ost file will not automatically delete deleted emails even if they were deleted from the mailbox so the OST may still contain copies of deleted emails.

The cache contains a copy of the mailbox and is controlled by the mailbox on the server. If you delete a file from the mailbox on the server this will also show up on the OST file.
 
I believe you should be looking at the mailboxes on the server and see why emails are deleted there.
There are no archiving solutions in place that may be archiving the emails?
Any events?

The connection problems shouldn't be occurring. Have a run at the Exchange Analysers, they hopefully tell you something's up: http://www.microsoft.com/technet/prodtechnol/exchange/downloads/2003/analyzers/default.mspx

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