c# qr code with logo Figure 5-41 The user view of public groups presented by ECP. in C#

Generating QR Code ISO/IEC18004 in C# Figure 5-41 The user view of public groups presented by ECP.

Figure 5-41 The user view of public groups presented by ECP.
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Figure 5-42 shows the properties of a group as viewed through ECP. Membership requests are under the control of an administrator as requests to join are automatically rejected, so we know that the MemberJoinRestriction property is set to ApprovalRequired. You can edit the properties of a distribution group with EMC to set the exit and join properties (on the Membership Approval tab) or use the Set-DistributionGroup cmdlet. For example:
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Set-DistributionGroup Identity 'SharePoint Interest List' MemberJoinRestriction 'ApprovalRequired' MemberDepartRestriction 'Open'
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Managing groups with ECP
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Figure 5-42 Viewing group properties.
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The concept of self-maintaining groups that use this feature is explored in more detail in 6.
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Allowing users to create new groups through ECP
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If you decide to permit users to create groups by changing the Default Role Assignment Policy to include the MyDistributionGroups role, you ll see the first effect of the policy change when users open the Groups section in ECP. As shown in Figure 5-43, because of the assignment of the MyDistributionGroups role, ECP now displays a new list of groups called Public Groups I Own, along with options to create a new group or to update the details of an existing group. The groups shown in this list are those for which the user is listed as one of the group managers. You can discover which users are the managers of a group by viewing its properties through EMC. Alternatively, you can use the Get-DistributionGroup cmdlet in EMS.
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5 Exchange Management Console and Control Panel
Figure 5-43 ECP after the MyDistributionGroups role is assigned.
In this example, we discover the users registered as managers of the CEO Staff group and see that there are two users listed. If either of these users accesses ECP, he will see the CEO Staff group listed in the set of groups that he owns.
Get-DistributionGroup Identity 'CEO Staff' | Format-Table ManagedBy
ManagedBy --------------{contoso.com/Exchange Users/Redmond, Tony, contoso.com/Exchange Users/CEO Support Admin}
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If this doesn t seem like a good idea, we can change the policy to remove the ability to create new groups.
Planning for user-created groups
Before you allow users to create groups, you should consider the consequences that might flow from this decision:
Users don t typically plan how to best create groups and are prone to create groups without checking to see whether a comparable group already exists. They are unlikely
Managing groups with ECP
to follow any naming conventions. You could therefore end up with duplicated groups scattered throughout the GAL. Exchange 2010 SP1 supports the creation of a naming policy for groups.
In the same light, apart from occasionally updating group membership, users are unlikely to maintain groups. Orphan groups will occur after users leave the organization. The result is the accumulation of many outdated and unwanted zombie groups that linger in the GAL until an administrator deletes them. Users can create mail-enabled universal groups; they cannot create mail-enabled universal security groups. If a user needs a mail-enabled universal security group, she can create a group and then ask an administrator to upgrade it to become a universal security group. Consider the appropriate location in Active Directory for user-created groups. For more information about how to configure the default organization unit for group creation, refer to the section Defining a default group location and group naming policy earlier in this chapter.
These issues escalate in importance as the organization grows. Allowing users to create their own groups in a small organization where it s easy to keep track of what s happening in the GAL is one thing; allowing 100,000 users to create groups and ending up with 250,000 extra groups in the GAL is quite another. Users will find it difficult to find recipients in the GAL and OAB file downloads will become larger and larger. Even worse, the thought of cleaning up tens of thousands of unwanted or unused groups on a regular basis is numbing.
Maintain groups but don t create!
In Exchange 2010, the Default Role Assignment Policy is not granular enough to block users from creating new groups while allowing them to manage groups that they own. However, you can create a new customized management role and add it to the default role assignment policy to replace the existing role assignment that allows users to create their own groups. The new management role is based on the old role, but we remove the cmdlet that allows users to create new groups so that all that remains are the cmdlets that allow users to update the existing groups that they own. The procedure to create the new management role and add it to the Default Role Assignment Policy is as follows:
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