Assigning Full Access Permissions to a mailbox by Security Group

I have been trying to assign full access permissions to a mailbox based on a mail-enabled universal security group. I can add the group successfully either via the EMC or the shell. However, the users in that group never automatically see that mailbox in the left-pane of their Outlook. If I merely give a user permission to that mailbox it works like a charm.

My environment consists of Exchange 2010 SP3 with Outlook 2010 and 2013 clients.

Does anyone know an easy way to do this?
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Auto-Mapping Does Not Work With Groups, if you need auto-mapping then you need to assign permission directly on the mailbox. If interested, following script will assign individual permission on a shared mailbox for all members of the distribution group..
Get-DistributionGroupMember GroupA | % {
Add-MailboxPermission -Identity "Shared_mailbox" -User $_.Name -AccessRights ‘FullAccess’

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MCSFAuthor Commented:
Subsun - your workaround script did the trick. It's not ideal, but it's a heck of a lot easier than adding them one at a time.

Dipersp - I have been through that thread before and I didn't find any workarounds in there that worked for me.
There are many workaround scripts for this issue in internet which you can schedule daily to update all user mailbox full access permission based on groups. Test the scripts thoroughly in lab before implementing in production, also it's better to schedule it after office hours.
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