When you login to exchange after giving username and password you might get “HTTP/1.1 503 Service Unavailable” there are lot of articles on web for technical reasons of this error,
But here i want to share my case, i recently did a disaster recovery of exchange 2003, everything went fine, databases mounted successfully and all services [...]
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The message store of the SMTP service is created when you install the service on IIS. SMTP utilizes this directory structure to process mail. The folders created in the \Inetpub\Mailroot directory structure (message store) are listed below:
Pickup: The SMTP service processes messages from the Pickup folder as outbound messages or as messages for delivery. If [...]