Ændre mailroot dir til IIS SMTP service EFTER installation

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You have to modify methadata information for IIS.
There are two methods. Use IIS Resource kit - get it from Microsoft. And there was Metadata Explorer.
Other way is to use adsutil.vbs from Intepub/Adminscripts

With adsutil.vbs - from command prompt
this will list settings for the first smtp instance.
adsutil.vbs enum /SmtpSvc/1
It is tree-like structure. You can view other paths if you use enum on higher node.
There you will notice parameters
DropDirectory
BadMailDirectory
PickupDirectory
QueueDirectory
You can set them with
adsutil.vbs SET /SmtpSvc/1/BadMailDirectory "f:\forgotten_one"

PS. If asked first time to register cscript as defualt engine - answer yes, or always start adsutil.vbs like "cscript adsutil.vbs"