Reference a folder not under the default inbox
GetDefaultFolder(olFolderInbox)
is a shortcut.
You can reference any folder the long way.
Sub reference_walk_the_path()
Dim outapp As Outlook.Application
Set outapp = CreateObject("outlook.application")
Dim olitem As Object
Dim fldSpamDigest As Outlook.MAPIFolder
' from the default inbox to the parent which is your mailbox
Set fldSpamDigest = outapp.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox).Parent
' from the mailbox to a folder at the same level as the Inbox
Set fldSpamDigest = fldSpamDigest.folders("Spam Digests")
' or
' directly from the mailbox to a folder at the same level as the Inbox
'Set fldSpamDigest = outapp.GetNamespace("MAPI").folders("your email address").folders("Spam Digests")
For Each olitem In fldSpamDigest.Items
If dateDiff("d", olitem.CreationTime, Now) > 14 Then olitem.Delete
Next
Set fldSpamDigest = Nothing
Set olitem = Nothing
Set outapp = Nothing
End Sub