Convert Linked mailbox to a regular user Mailbox

We are running Exchange 2007 SP3 Rollup 6 and Outlook 2010

I am trying to convert a Linked mailbox to a regular mailbox using the Set-User command with argument -LinkedMasterAccount $null but it just does not work. I have tried different combinations but they all error out.

Please help.

ERROR:

[PS]>Set-User -Identity User@Domain.com -LinkedMasterAccount $null
Set-User: A parameter cannot be found that matches parameter name 'LinkedMasterAccount'. At line:1 char:69
+ Set-User -Identity User@Domain.com -LinkedMasterAccount <<<< $null
    + CategoryInfo          : InvalidArgument: (:) [Set-User], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.Exchange.Management.RecipientTasks.SetUser

[PS]>Set-User -Identity Domain\User -LinkedMasterAccount $null
 Set-User: A parameter cannot be found that matches parameter name 'LinkedMasterAccount'.
At line:1 char:62
+ Set-User -Identity Domain\User -LinkedMasterAccount <<<<  $null
    + CategoryInfo          : InvalidArgument: (:) [Set-User], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.Exchange.Management.RecipientTasks.SetUser
RBCLSAsked:
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JBackesConnect With a Mentor Commented:
This example converts the shared mailbox ConfRoom11LARGE to a room mailbox.

Set-Mailbox ConfRoom11LARGE -Type Room
You can use the following values for the Type parameter:

Regular
Room
Equipment
Shared

you may need to disable the mailbox and connect it again to connect as User Mailbox.

JB
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RBCLSAuthor Commented:
Thanks for the tip. However, disabling the mailbox will remove all permissions on the mailbox, such as Send As, Full Access, folder permissions, and calendar delegation. Is there another way?
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Neal58Commented:
There is no other way as the mailbox is assigned to a different user. The user you will want to make it a mailbox for will still need the permissions manually assigned when the mailbox is reconnected.
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RBCLSAuthor Commented:
Sorry for the delay in returning, a couple of work emergiencies took all my attention. With regard to the answers, although they not really resolve my problem,  I am accepting JBackes' answer as a reasonable solution.
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