What are Microsoft execs doing at a stamp show in Taiwan? No, they're not showing their passion for that geekiest of hobbies, stamp collecting (at least we don't think so). Turns out that Microsoft's working on software for an RFID-based system that would allow senders, receivers and shippers to automatically track a package's location through all stages of the shipping cycle. The system could also automatically notify senders when a package is signed for by its recipient, with notification to be sent out via SMS or, natch, MSN Messenger.