In Exchange 2010, you can use Retention Policies to manage message retention. Retention Policies consist of delete tags, i.e. retention tags with either Delete and Allow Recovery or Permanently Delete actions, or archive tags, i.e. retention tags with the Move To Archive action, which move items to the user’s archive mailbox.

Depending on how they’re applied to mailbox items, retention tags are categorized as the following three types:

1. Default Policy Tags (DPTs), which apply to untagged items in the mailbox – untagged items being items that don’t have a retention tag applied directly or by inheritance from parent folder. You can create three types of DPTs: an archive DPT, a delete DPT and a DPT for voicemail messages.
2. Retention Policy Tags (RPTs), which are retention tags with a delete action, created for default folders such as Inbox and Deleted Items. Not all default folders are supported. You can find a table showing the default folders supported for RPTs in Understanding Retention Tags and Retention Policies. Notably, Calendar, Tasks and Contacts folders aren’t supported.
3. Personal Tags, which are retention tags that users can apply to items and folders in Outlook 2010 and Outlook Web App. Personal tags can either be delete tags or archive tags. They’re surfaced in Outlook 2010 and OWA as Retention policies and Archive policies.

To deploy retention tags, you add them to a retention policy and apply the policy to mailbox users.

In Exchange 2010 SP1, we added support for the Notes folder. In Exchange 2010 RTM, items in the Notes folder aren’t processed. After you upgrade to SP1, if the user’s retention policy doesn’t have a RPT for the Notes folder, the DPT from the user’s policy will apply to items in that folder.

In existing deployments, your users may not be used to their notes being moved or deleted.

To prevent the DPT from being applied to a default folder, you can create a disabled RPT for that folder (or disable any existing RPT for that folder). The Managed Folder Assistant, a mailbox assistant that processes mailbox items and applies retention policies, does not apply the retention action of a disabled tag. Since the item/folder still has a tag, it’s not considered untagged and the DPT isn’t applied to it.

Figure 1: Create a disabled Retention Policy Tag for the Notes default folder to prevent the Default Policy Tag from being applied to items in that folder

Note: You can create a disabled RPT for any supported default folder.

Why are items in the Notes folder still archived?

If you create a disabled RPT for the Notes folder, you’ll see items in that folder are not deleted, but they do continue to be moved to the archive! Why does this happen? How do you prevent it?

It’s important to understand that:

• A retention policy can have a DPT to archive items and a DPT to delete items. Both apply to untagged items.
• The move and delete actions are exclusive of each other. Mailbox folders and messages can have both types of tags applied – an archive tag and a delete tag. It’s not an either/or proposition.
• If you create a disabled RPT for the Notes folder to not delete items, the archive DPT for the mailbox would still apply and move items.
• When it comes to archiving, there’s only one archive policy that administrators can enforce – the DPT with ‘Move to archive’ action. You can’t create a RPT with the ‘Move to archive’ action. This rules out using the disabled RPT approach to prevent items from being moved.
• Users can apply a personal tag to a folder or messages to move items sooner or later than the default archive policy for that mailbox.

How do you prevent items in a default folder from being archived?

There’s no admin-controlled way of doing this, short of removing the archive DPT from a retention policy. However, removing the archive DPT would result in messages not moving to archive automatically unless the user applies a personal tag to messages or folders.

The workaround is to have users apply the Personal never move to archive personal tag (displayed as Never under Archive Policy in Outlook/OWA) to a default folder. The tag is included in the Default Archive and Retention Policy created by Exchange Setup. You can also add this tag to any Retention Policies you create.

Figure 2: Users can apply the Never archive policy to a default folder to prevent items in that folder from being archived

Note: You can’t use Outlook 2010 to apply an archive policy to the Notes default folder or individual notes items. Users wanting to apply an archive policy to the folder must use OWA.

Source: MSExchange Team