If you don't mind reprogramming the system, it is as painless as purchasing the new software, plugging it in (power down first), then programming. If there are a lot of phones in complex configuration (or you just don't want to reprogram), you will have to upgrade in a couple of steps, using the "upgrade tool". This process saves most of the reprogramming, but I have heard of people losing everything anyway.
Good Luck!
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BCM Guy
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