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Outlook 2010 / Exchange 2007 (SBS2008) Performance Issues

My customer has a small office with 8 users using SBS 2008 / Office 2010. They have been reporting performance issues and typically a message is shown stating that Outlook is retrieving data from Exchange Server and sometimes Outlook shows as Not Responding for periods of time before resuming normal operation. I posted this problem previously and was advised to increase the memory in the server which I have now done taking it to 8 GB. There is some improvement but the users are still reporting delays.

The users all insist on sharing All of each other's folders including deleted, sent items, calendars etc. Outlook is set up so that all the other users mailboxes are opened when Outlook is started. They  are also disinclined to archive anything so on average the folders contain 2000 - 8000 mail items. With caching set to On, the offline folders become very large ( e.g. 16 GB)  and I think that this is maybe contributing to the problem.  I would like some advice on how would be best to set up the caching and whether having all the folders in all the mailboxes open for each user is a good idea. Also any further suggestions on how I could improve performance .

Other possible relevant information.
I am using the Redemption Add In to allow mail to be sent from a custom Access DB.
I have applied the latest Office Service Packs .


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1 Solution
it looks ost file is corrupted  I will suggest  re-name the ost file  and download again & then check.

Below is the article for reference

jhswinsonAuthor Commented:
There are several users experiencing the same problem and I have already re-created the ost files to see if it fixes the problem but the users are still reporting problems.
Md. MojahidCommented:
Editing NK2 with NKEdit
jhswinsonAuthor Commented:
Disappontingly none of the answers are really relevant to the question as there are several users on different computers experiencing the problem. I will leave the question up for a short while longer and if still not solutions I will rephrase the question or maybe try to break it up into separate questions.
jhswinsonAuthor Commented:
None of the answers came anywhere near to providing a useful solution or even a way of establishing what the fault is. I am not quite sure if this is the correct way of handling the situation where this happens if not I would be grateful if someone would advise me.
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