Exchange 2007 Powershell command to find shared calendars? Migration 2013 prep.

Question

I'm attempting to clean up my AD and Exchange mailboxes ( for a migration to 365) but I've run into a snag. It turns out that I have a number of departments that are using shared calendars that were created and shared by former employees.
Environment:  Server 2008R2, Exchange 2007, Outlook 2010.
Most of these calendars were not created as rooms, or in a public storage container like 2000 used to use.  They are all end user created, shared and stored.
The problem is I can't delete a lot of these inactive user accounts because of these shared calendars.  I want/need to find ALL of them (meaning any user account with a shared calendar), export them and move them to a room so I don't
have to worry about personnel changes anymore.
Is there a way to find all of these shared resources (calendars) in PowerShell??  I can't really ask my end users.  Many of them still think "deleted items" is a storage compartment.

Answer 1

Try this command to list-out the calendar permission of users :
Get-MailboxFolderPermission <mailbox>:\Calendar
You can use DSQuery command to remove inactive users in active directory : http://portal.sivarajan.com/2010/03/delete-stale-or-inactive-computer.html
You can also have a look at this technet blog that describes in depth to remove inactive AD users: http://blogs.technet.com/b/heyscriptingguy/archive/2011/11/30/use-powershell-to-find-and-remove-inactive-active-directory-users.aspx
Further, to accomplish this task automatically, you can take a look to this proficient application also (http://www.lepide.com/active-directory-cleaner/) that would be a good approach in order
to find out and cleanup inactive users in active directory in a quick attempt.