Together with the first available Pocket PC Phone Edition devices which are running Windows Mobile 5.0, like the i-mate JasJar or the T-Mobile MDA Pro, this topic came up since the marketing materials might mentioned something of 64 MB RAM while you find out later that you get 50 MB on the device only and for sure everybody asked what's wrong here?
Mike Calligaro from Microsoft has posted a comprehensive answer in the Windows Mobile Team blog" and if you are worried about this "issue" too, you should check out his explanation:
So you just bought a brand new WM5 device. The box says it's got 64M of RAM. You go digging through control panels on the device and find one that says it's only got 50M. Is something wrong? Should you be worried about this? The short answers are "No" and "No." This blog entry will explain why.
First though, please make sure you've read my earlier "RAM, ROM, NAND, NOR--that's a lot of capital letters..." entry. I'm assuming here that you understand what I described there.
If you also want to learn more because you either have a Windows Mobile 5.0 Pocket PC already or you plan to buy one, you should give Mike's explanation a read.
Cheers ~ Arne