What is Outlook constantly updating in cache mode?

We have an Exchange 2010 - Exchange 2003 co-existence domain. The Exchange 2003 servers will be decommissioned soon. We use Symantec Enterprise Vault for Archiving our emails.

Users are connected to Exchange 2010 using Outlook 2007, 2010 in cache mode

Lately I have noticed that when users return to the office after having their computers shut down for a few hours, and start they computer and open Outlook, Outlook reports that it is updating the folders and seems to download around at least 10MB (this is shown in the Outlook Status bar at the bottom). However, most of the times the users do not have any new emails that have come in or have sent any emails via WebApps.

Is there a way I can find out what all is being "updated" by Outlook? I enabled Advanced Diagnostic Logging in Outlook but I do not get much info from it.

I would really appreciate help in this.

Thank you.
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Are all these users using Laptops, or are they desktops.

If they are desktops, any particular reason they are using cached Exchange Mode?
NivleshAuthor Commented:
there are a mixture of laptops and desktops. We have our mailboxes hosted over the WAN in our datacenter. Cache mode enables the users to get quick access to emails that have already been downloaded by loading it from the "cache" instead of having to go over the WAN to get the email. Most of the emails are at least 1MB so over the WAN wasnt a good option.
Madan SharmaConsultantCommented:
Navigate to the outlook icon in taskbar in the right on it by pressing Ctrl key and click on connection status and select Local Mailbox. Here you can see for what outlook is trying to update.

And also make sure that all the connection have been established with exchange server under General Tab.

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nashim khanExchange AdministratorCommented:

See the below article it will help you to fix the issue.


Thanks & Regards
Nashim Khan
NivleshAuthor Commented:
Thank you for your responses

@akicute555 the information showed in Local Mailbox is already shown in the status bar for Outlook (except the % completed)
@nashimkhan123 thank for that link. However, the issue is happening to pretty much all the users and it would be impractical for me to do a scan pst for all of them.

Is it possible to find the list of individual items that are being "synched" or cached?

Thank you all.
NivleshAuthor Commented:
On the exchange server I see that there is a NT Authority\System accessing the mailboxes. Any idea how I can find out what process this is?
nashim khanExchange AdministratorCommented:


Check this KB Articles.

Thanks & Regards
Nashim khan
NivleshAuthor Commented:
Thank you all for your help. I wasnt able to exactly find the answer I was looking for but akicute555 came very close.
nashimkhan123 thank you for that article. unfortunately that relates to exchange 2000 and 2003 but we are running Exchange 2010
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