Why aren't there notifications for updates to built-in applications? On July 29th, Google released an update for the Gmail application, that brought it to version 2.3.5. Since I had version 2.3.4, I was expecting to be notified of the update shortly as I had for updates to other applications including ones that came pre-installed on my phone, such as Google Maps.

Alas, I still haven't received the notification, even though I can see the update available in the market (yes, I realise I can download it manually).

I have since surmised (though this is a guess on my part) that the difference is that gmail is considered a "built-in" app, but Google Maps, while pre-installed on my device, is not considered built-in.

Is this right?

If it is, why are built-in apps treated this way? Is there a technical reason, or are they somehow considered more sacrosanct, because of their status n the platform?

Update:

Apparently, the SDK doesn't list Google Maps as built in, but it does list the "email" app.  Furthermore, Google Maps is listed as a "Downloaded App" but Gmail isn't.
If the app has never been updated via the market (you are still using the version that was bundled in the ROM) then there's no link between the market and the installed app. Because of that, you won't get update notifications. Once you install a newer version from the market you will begin to receive notifications of future updates.