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Microsoft Exchange Server 2010 : Getting Started with Email Archiving - Exchange Server 2010 Email Archiving - Policies

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8/2/2014 4:02:03 AM

One of the major new features that both Microsoft and customers are excited about in Exchange 2010 are the compliance and archiving features. The features available in Exchange 2010 allow you to create retention rules to preserve information regardless of the end user's mailbox management and filing habits.

The following is a list of new messaging and compliance features that have been included in Exchange 2010:

  • New interface for applying retention policies

  • Auto-tagging for retention policies by inheriting the default retention tag policy from the parent folder

  • A GUI that allows nontechnical people to perform cross-mailbox searches

  • New transport rule predicates and actions

The one thing that does have to be clarified, though, is the target market of Exchange 2010 archiving. By no means should the solution be confused or compared with an "Enterprise" scaled solution like a Symantec Enterprise Vault or Mimosa NearPoint. Microsoft refers to these solutions as "business archives" while Exchange 2010 is more of a "personal archive." We had to set the record straight on this as many people have been confused, and when it comes down to compliance archiving or enterprise records retention, you can't afford to make mistakes.

1. Personal Archive vs. Organizational Archive

So when should you use the Personal Archive that is available in Exchange 2010 and when should you use an organizational archive solution available through third parties? In essence, the decision has to be made based on the requirements and functionality offered by these solutions. Microsoft positions Exchange 2010 as a personal archive and not as a business archive solution. Microsoft's basic archiving solution enables organizations to get rid of PST files, implement large mailboxes, and provide advanced search. It does not provide records management or preservation of electronic information beyond Exchange and write-once, read-many (WORM) storage. Organizations that have stricter requirements to retain information beyond email or have the need to store information on WORM storage should look at a business archive or organizational archive solution. Organizational archiving goes beyond the scope of the Personal Archive and delivers full mailbox capture for all users, full single-instance storage across all data, and advanced search and case management tools for eDiscovery.

By way of comparison, a typical third-party email archival solution can be expected to deliver all or a portion of the following key functions in addition to the Personal Archive functionality in Exchange 2010:

  • Logs, WORM, read only

  • Single instancing/compression

  • Configuration auditing

  • Mailbox auditing

  • Regulatory accreditation

  • Federated discovery, retention, and reporting across multiple content sources

  • Data mining and visualization

  • Case management and advanced eDiscovery

  • Content monitoring and supervisory tools

  • Archive for Bloomberg data and other non-Microsoft IM data

  • Archive for both files and SharePoint

Microsoft is positioning the new archiving functionality in Exchange 2010 for basic storage management, PST archiving, and discovery while leaving the door open for third-party vendors to offer additional value that is necessary for organizational archiving. Small organizations will find the basic features of Exchange 2010 satisfactory to reduce the strain on storage growth and eliminate PST files. However, for organizations that require full email retention and advanced eDiscovery, a third-party email archiving solution is the answer for the next few years.

2. Policies

The technology used in Exchange Server 2010 to maintain records management is called messaging records management (MRM) and helps organizations reduce legal risks associated with email and other communications. It is much easier to make an organization comply with company policies and regulatory needs with MRM, and within Exchange Server 2010 this is accomplished with retention policies. Exchange 2010 has multiple sets of policies available for maintaining and moving data from the primary mailbox to the archive:


Retention Policy Tag

A retention policy tag (RPT) applies retention settings to the default folders (Inbox, Deleted Items, and Sent Items) in a mailbox, and all items that are in these default folders inherit the folders' policy tag. Users are not able to change the tag that is applied to a default folder, but they can apply a different tag to individual items in one of the default folders. You can create RPTs for the following default folders:

  • Deleted Items

  • Drafts

  • Inbox

  • Junk Mail

  • Outbox

  • Sent Items

  • Rss Subscriptions

  • Sync Issues

  • Conversation History

RPTs are not supported for the Calendar, Journal, Notes, and Tasks folders. Currently, you can only use the MoveToArchive retention action with tags of type All and Personal; Microsoft doesn't support using MoveToArchive against specific folders.


Default Policy Tag

Default policy tags (DPTs) are used to apply retention policies to untagged mailbox items. Untagged items are mailbox items that either did not receive a retention tag from the folder that they are located in or didn't get a policy applied explicitly by the user. DPTs are created by specifying the type All. A retention policy should not contain more than one DPT.


Personal Tags

Personal tags are available to users in their mailbox as part of their retention policy, and they can apply these tags to folders they create themselves or to individual items. This allows end users to tag information they consider critical and therefore apply a longer retention period to it.

You can define RPTs with the following actions:


Move To Archive Policy

Automatically moves messages from the primary mailbox to the personal archive. Available options are 1 year, 2 years (default), 5 years, and Never. This policy can help keep the mailbox under quota. The policy works like the Outlook Auto-Archive functionality without creating the PST file and will create a folder name that matches the primary mailbox folder name from which the item was moved.


Move To Deleted Items Policy

Automatically deletes messages and moves them to the Deleted Items folder. Delete policies are global because they remain tied to the message when they move to the archive and they remove unwanted items.


Delete And Allow Recovery

Emulates the behavior when the Deleted Items folder is emptied or the user deletes a message using Shift-Delete. Messages move to the Recoverable Items folder when deleted item retention is configured for either the mailbox database or user. Recoverable Items, also known as the "dumpster," gives the user another chance to recover deleted messages.


Permanently Delete

Permanently deletes a message. A message is purged from the mailbox when this policy is applied; this is similar to a deleted message being removed from Recoverable Items. Once this happens, the user can no longer recover the message (although when single-item recovery or legal hold is enabled, the item is placed in the Purges folder of Recoverable Items and thus can be recovered by administrators).

The priority in which policies take effect is pretty simple. Explicit policies have a higher priority over default policies, and longer policies apply over shorter policies. An important thing to remember is that you can't apply a managed folder policy to a mailbox that has an archive mailbox enabled. The managed folder settings created can't use the MoveToArchive action.

During setup, Exchange Server creates a default archiving policy, which is a retention policy that contains the retention tags shown in Table 1.

Table 1. Default Retention Tags
Retention Tag NameTag TypeDescription
Default 2 Year Move To ArchiveDefaultApplies to items in the entire mailbox that do not have a retention tag applied explicitly or inherited from the folder. Messages are automatically moved to the archive mailbox after 2 years.
Personal 1 Year Move To ArchivePersonalMessages are automatically moved to the archive mailbox after 365 days.
Personal 5 Year Move To ArchivePersonalMessages are automatically moved to the archive mailbox after 5 years.
Personal Never Move To ArchivePersonalMessages are never moved to the archive mailbox.

The default archiving policy is automatically assigned to each mailbox that has archiving enabled. The tags will be made available to the mailbox user after the mailbox assistant has processed the mailbox. The user can then use these tags and apply them to folders or messages.

2.1. Moving Items Between Folders

When an item is moved from one folder to another, it inherits the retention tag from the new folder location. If there is no retention policy tag active on that particular folder, the item automatically gets the default policy tag. However, when the item has a specific tag assigned to it, this tag will always take priority over any folder-level tags or the default tag.

2.2. Setting a Retention Tag

You can set retention policies to a direct mailbox and distribution group. Keep in mind that new members added to a distribution group do not automatically get the retention policy of that group, and you should run the distribution group policy cmdlet at regular intervals. The following example applies the Finance retention policy to John Doe's mailbox:

Set-Mailbox "John Doe" -RetentionPolicy "Finance"

The next example applies the Finance retention policy to members of the distribution group Seattle-Finance:

Get-DistributionGroupMember -Identity "Seattle-Finance" | Set-Mailbox - 

RetentionPolicy "Finance"

2.3. Changing a Retention Tag Policy

You can also change the policy that is applied to mailboxes to a new policy. The following example applies the new retention policy "New-Retention-Policy" to all mailboxes that have the old policy "Old-Retention-Policy":

$OldPolicy=(Get-RetentionPolicy "Old-Retention-Policy"}.distinguishedName
Get-Mailbox -Filter {RetentionPolicy -eq $OldPolicy} -Resultsize Unlimited |

Set-Mailbox -RetentionPolicy "New-Retention-Policy"


2.4. Deleting and Removing a Retention Tag

When you remove a retention tag from the retention policy that is applied to the mailbox, it is no longer available to the user and therefore can no longer be applied to items in the mailbox. Items that have been specifically stamped with this tag, however, will continue to be processed by the mailbox assistant with these settings.

Deleting a tag using the Remove-RetentionPolicyTag cmdlet will not only remove the retention tag from being available to the user, but also remove the tag from Active Directory. The next time the mailbox assistant runs, it will restamp all the items that had the removed policy applied and apply the default policy tag. If you removed the tag from a large number of mailboxes and items, this could result in a significant increase in resource consumption on your mailbox servers.

2.5. Retention Hold

Retention might take actions on new email messages before end users get to them when they are away or unable to access email due to vacation or other reasons. Depending on the policies that may be active and applied to the user, this could mean that messages may have been moved from the primary mailbox to the archive or even deleted. For these users, you have the option to temporarily suspend the retention policies from processing the mailbox for a set amount of time by placing the mailbox on a retention hold. You can specify a retention comment that will notify and inform the user (or another user who might have access to the mailbox) about this hold, and explain when it begins and ends. These retention holds are only visible in supported Outlook clients, however, and can be localized in the language of the user's preferred language setting.

Applying a retention hold will not modify or change mailbox quota limits if they are applied, and it might be advisable if you have end users leaving for an extended period of time to increase or remove the mailbox quota limits. Also, it might take the user a while to catch up on email after he returns, so give the user some time after he returns to work to go through the messages before removing the retention hold status.

Other -----------------
- Microsoft Exchange Server 2010 : Getting Started with Email Archiving - Industry Best Practices
- Microsoft Exchange Server 2010 : Getting Started with Email Archiving - Archiving
- Microsoft Exchange Server 2007 : Implementing Client Access and Hub Transport Servers - Installing the Hub Transport Server
- Microsoft Exchange Server 2007 : Implementing Client Access and Hub Transport Servers - Transport Pipeline
- Microsoft Exchange Server 2007 : Hub Transport Server Policy Compliance Features (part 4) - Message Classification , Rights Management and the Hub Transport Server
- Microsoft Exchange Server 2007 : Hub Transport Server Policy Compliance Features (part 3) - Journaling
- Microsoft Exchange Server 2007 : Hub Transport Server Policy Compliance Features (part 2) - Disclaimers
- Microsoft Exchange Server 2007 : Hub Transport Server Policy Compliance Features (part 1) - Transport Rules
- Microsoft Exchange Server 2007 : Implementing Client Access and Hub Transport Servers - Understanding the Hub Transport Server
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