In the Office Customization Tool, in the tree view, locate Outlook, and choose Add Accounts. In the Account Name column of the reading pane list, choose the account that you want to configure, and then choose Modify. The Exchange Settings dialog box appears.

Note that in the tree view of the OCT you must choose Outlook Profile and then select Modify Profile or New Profile to add an Exchange account and configure Exchange Server settings.

To enable or disable Cached Exchange Mode, or to specify default download behavior when Cached Exchange Mode is enabled, choose the Cached Mode tab.

Choose Configure Cached Exchange Mode and then select the Use Cached Exchange Mode check box to enable Cached Exchange Mode for users. By default, Cached Exchange Mode is disabled if you do not select the Use Cached Exchange Mode check box.

If you enabled Cached Exchange Mode in step 3, select a default download option on the Cached Mode tab:

• Download only headers   Users see header information and the beginning of the message or item body (a 256 bytes plain-text buffer of information). Full items can be downloaded later in several ways. For example, by double-clicking to open the message or by clicking Download the rest of this message now in the reading pane.

• Download headers followed by the full item   All headers are downloaded first, and then full items are downloaded. The download order might not be chronological. Outlook downloads headers followed by full items in the folder that the user is currently accessing, and then downloads headers followed by full items in folders that the user has recently viewed.

• Download full items   Full items are downloaded. We recommend this option unless you have a slow network connection. The download order might not be chronological. Outlook downloads full items in the folder that the user is currently accessing, and then downloads full items in folders that the user has recently viewed.

To turn off Headers Only mode, select the Download full items option button and clear the On slow connections, download only headers check box. The default behavior, when users have slow connections, is to download only headers. There are scenarios in which Outlook perceives that users have slow connections such as when users' data throughput is fast, or vice versa. In these situations, you might want to set or clear this option.

Disable the download of shared folders as part of Cached Exchange Mode synchronizations to users' .ost files. By default, in Outlook 2013, shared mail and non-mail folders are downloaded. Downloaded shared folders increase the size of users' .ost files. Be aware that the setting Download shared non-mail folders applies to both mail and non-mail shared folders in Outlook 2013. If you want to only disable the download of shared mail folders, see step 8.

Download Public Folder Favorites as part of Cached Exchange Mode synchronizations to users' .ost files. By default, Public Folder Favorites are not downloaded. As with shared folders, downloading Public Folder Favorites increases the size of users' .ost files. Also, synchronizing Public Folder Favorites causes additional network traffic that might be unwelcome for users who have slow connections.

If you must disable shared mail folders (like a delegated Inbox) but want to allow the download of shared non-mail folders (like Calendar) for profiles that use Cached Exchange Mode, follow these steps:

1. In OCT, in the tree view, locate Additional Content and then click Add registry entries.

2. In the reading pane, click Add.

3. Enter the following information:

   Registry key to allow the download of shared non-mail folders

   Root	Data type	Key	Value name	Value data
   HKEY_Current_User	REG_SZ	Software\Microsoft\Office\15.0\Outlook\Cached Mode	CacheOthersMail	0

4. Choose OK.

In Group Policy, load the Outlook 2013 template.

To customize Cached Exchange Mode options, open the Group Policy Management Console (GPMC) and, in the tree view, expand Domains and then expand Group Policy Objects.

From the short-cut menu (right-click), choose the policy object that you want and then choose Edit. The Group Policy Management Editor window opens.

In the tree view, expand User Configuration, expand Administrative Templates, expand Microsoft Outlook 2013, expand Account Settings, and then choose Exchange. You can also expand Exchange and then choose Cached Exchange Mode.

In the reading pane, in the Setting column, open (double-click) the policy that you want to set. For example, in the Exchange reading pane, open Use Cached Exchange Mode for new and existing Outlook profiles.

Select Enabled and select an option (if appropriate).

Choose OK.

In Group Policy, load the Outlook 2013 template.

To configure a default .ost location, open the Group Policy Management Console (GPMC) and in the tree view expand Domains and then expand Group Policy Objects.

From the short-cut menu (right-click) of the policy object that you want, choose Edit. The Group Policy Management Editor window opens.

In the tree view, expand User Configuration, expand Administrative Templates, expand Microsoft Outlook 2013, expand Miscellaneous, and then choose PST Settings.

Open (double-click) Default location for OST files.

Choose Enabled to enable the policy setting.

In the Default location for OST files text box, enter the default location for .ost files. For example:

%userprofile%\Local Settings\Application Data\Microsoft\newfolder.

Click OK.

You can define a new default location for both Personal Outlook data files (.pst) and .ost files. After you choose PST Settings in the tree view, open (double-click) the Default location for PST files setting in the reading pane.

In Group Policy, load the Outlook 2013 template.

To prevent a new .ost file from being created, open the Group Policy Management Console (GPMC) and, in the tree view, expand Domains and then expand Group Policy Objects.

From the short-cut menu (right-click) of the policy object that you want, choose Edit. The Group Policy Management Editor window opens.

In the tree view, expand User Configuration, expand Administrative Templates, expand Microsoft Outlook 2013, expand Account Settings, and then choose Exchange.

Open (double-click) Do not create new OST file on upgrade.

Choose Enabled to enable the policy setting and then choose OK.