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Outlook 2007 Clients can't access Exchange 2013 Room Calendar

In Exchange Admin Center, in Recipients  > Resources: I have created several room Resource Mailboxes.  Our Outlook 2013 clients can view the calendars and book rooms as expected.

Outlook 2007 clients receive a dialog box "You do not have permission to view this calendar" "Do you want to ask Training Room to share his calendar with you?"  when trying to open the resource.

I need to know how to allow Outlook clients permissions to the Resource Mailboxes.  
FWIW:  We do not have enough Office 2013 Licenses to upgrade the Office 2007 users.
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Ron Nerad
Asked:
Ron Nerad
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1 Solution
 
Schnell SolutionsSystems Infrastructure EngineerCommented:
Test with one user to check if it helps you to visualize the calendar...

Add-MailboxFolderPermission -Identity ROOM@yourdomain.com:\calendar -User testuser@domain.com -AccessRights Reviewer
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Ron NeradNetwork  AdministatorAuthor Commented:
Schnell Solutions;  We're almost there.  I added "Author" permissions and it tests properly.  

Now, how do I add all the rest of the Outlook 2007 users, (I don't have that list) or do I give permissions to a group of users, or everyone regardless of MS Outlook version? (Figure ~200 users)
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Ron NeradNetwork  AdministatorAuthor Commented:
While waiting, I tried Add-MailboxFolderPermission -Identity ROOM@yourdomain.com:\calendar -User everyone@domain.com -AccessRights Reviewer

everyone@domain.com is a legitimate group, but while it threw no errors, it did not work either.
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Todd NelsonSystems EngineerCommented:
You can try these commands. However, they will only work when users are connected to their mailbox with an Outlook client.  It will be best if you can get a list of users that are using Outlook 2007.

This command checks for and displays the Outlook client versions for those users currently connected to their mailbox with Outlook 2007...

Get-ExchangeServer | Get-LogonStatistics | Where { $_.ClientVersion -like "12.0.*" } | Select UserName,ClientVersion,LastAccessTime,ServerName

Open in new window


This command will gather the array of information into a variable...

$Outlook2007Users = Get-ExchangeServer | Get-LogonStatistics | Where { $_.ClientVersion -like "12.0.*" }

Open in new window


This last command should add "Author" permissions for the specified room calendar for all currently connected Outlook 2007 clients...

$Outlook2007Users | ForEach-Object { Add-MailboxFolderPermission -Identity ROOM@yourdomain.com:\calendar -User $_.UserName -AccessRights Author }

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Hope this gives you enough information to proceed.

Reference...

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Ron NeradNetwork  AdministatorAuthor Commented:
Thank you both!
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