Outlook updating cached headers

Disable this group policy setting to force users to operate Outlook in online mode instead.

Do not sync in Cached Exchange mode when users click Send/Receive -- Enabling this group policy setting prevents users from manually synchronizing an offline folder with Exchange by pressing the Send/Receive button or the F9 key.

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A disadvantage of Cached Exchange Mode that the OST file is only cached locally.

When a user is working on another workstation a new OST file will be generated if not available.

When the connection to the Exchange server is not available you don’t have access to the mailbox.

Cached Exchange mode When the Outlook profile is configured in Cached Exchange mode a local cache file will be created from the mailbox.

I host my own Exchange Server, so that’s my primary mailbox.

I include multiple other mailboxes (such as my wife’s, my kids’, etc.).

If there are users in your company that have huge mailboxes and in addition need to log on different machines all the time, you may consider enabling “Download Headers” in order to avoid spending a lot of time doing a full sync of the information from their mailboxes.

In case you were wondering why Outlook is doing a full sync of the messages even after you enable in Define Send/Receive Groups menu the option “Download headers only” for an Outlook cached mode client, this blog can give you an overview about how these two options are intended to work.

This file is also known as the offline data file which can be recognized easily when looking at the extension which is OST.

By default the file is stored in The advantage of Cached Exchange Mode is that mailbox content is also available when you don’t have a connection to Exchange, excluded the new items which haven’t been cached.

The Send/Receive settings will be taken into consideration only when synchronizing in offline mode.

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