Final answer:
To pull a list of mailboxes that have not been accessed in 30 days, you can use the Search-MailboxAuditLog command in PowerShell.
Step-by-step explanation:
The correct command to use in PowerShell to pull a list of mailboxes that have not been accessed in 30 days is Search-MailboxAuditLog. This command allows you to search the mailbox audit log for specific user actions, including last accessed time.
Here is an example of how you can use the command:
Search-MailboxAuditLog -Identity <MailboxIdentity> -LogonTypes Owner -ShowDetails -StartDate (Get-Date).AddDays(-30) -EndDate (Get-Date) | Select-Object MailboxOwner,LastAccessed
This command searches the mailbox audit log for the specified mailbox identity, filters for logon types of 'Owner' (which includes actual user access), and selects only the MailboxOwner and LastAccessed properties for the output.
None of the provided options (a-d) are correct PowerShell commands for finding mailboxes that haven't been accessed in a certain number of days. To accomplish this task in a Microsoft Exchange environment, you can use the Exchange Management Shell with a command similar to the Get-MailboxStatistics cmdlet. For instance, you could use Get-Mailbox to retrieve all mailboxes, and then pipe the results to Get-MailboxStatistics to filter out those that haven't been accessed in the last 30 days with a script that utilizes the .LastLogonTime property.
Here's an example command:
Get-Mailbox -ResultSize unlimited -Filter {RecipientTypeDetails -eq 'UserMailbox'} | Get-MailboxStatistics | where {$_.LastLogonTime -lt (Get-Date).AddDays(-30)}
Note that this sample script fetches all user mailboxes and filters out those that were not logged into within the past 30 days.