A bit of history, because then more difficult to explain. Since its inception (and it was the commercials in 2003 if I remember correctly), BlackBerry gave its users only two advantages, but these advantages were not at that time have competitors: (1) guaranteed message delivery time; (2) encryption of all traffic from the BES (which standards must stand inside the DMZ) to abrenskogo device. At that time nobody did that. TEXTS could goes days (72 hours waiting at SMSC — norm), mail or rush every 5 minutes or wait the sea weather. So BB was first evaluated by traders who need the speed of information transmission and secrecy. Well punters (especially lucky) in America — at the level of the Gods. And if they go with BB, this platform quickly became imageway for corporate klietnov. Just looking at BB, MS, swing and invented his PuchMail for WinMo, which actually started only in WinMo5.1 (it was not even in 2005 and later)
Now, in order asked questions.
1. They are not related things. "The kitten is warm because fluffy". No the kitten is warm and furry. You can, of course, to say that PushMail saves bandwidth due to the constant connection service, but do you imagine a "permanent connection" in the Internet? Static networks are not working. Nuger HeartBit — constant test pulses. MS, for example, simply refers to the ActiveSync server, an HTTP request with a very long response period. If on appears on the server it is passed to the callback. If the waiting time ends, the device raises the following session. And so all the time. You can see details at site MS Protocol description vSync. Details about BB I do not know, but it is unlikely there is something very different. And traffic compression is a simple algorithm ZIP hardware, there is also nothing original there. Another issue is that Paraty ZIP-th traffic then encryption is provided and this in itself adds a bit of traffic.
2. As said above — if BB have an agreement with the operator. Often this results in the fact that under the BB needs a separate tariff, to which you can connect only "when buying devaysa from the operator"... I'll need to check with your Opsosom.
3. I think the same as in paragraph 2
4. Roaming the Golden cow of all operators. Ten times to clarify this matter with the operator. Only if BB will pay one and another Opseu — then you roaming traffic will be free.
5. Yes, it is "vaunted encryption" in the best sense of the word. Quite strong thou a proprietary encryption algorithms BES <-> Smartphone. That is why our intelligence services so long to certify this system and certified in a very "neutered" version is when BES is the operator and between the operator and the email client — although the wind fistula (well, it's type, the client should care, but, again, all within the framework permitted by our special service protocols and systems).
6. Almost answered above. Compression, of course, but on top of it is the encryption, which let's not much, but traffic adds.
7. In Russia only "here, this a phone that no one else has!" In America is the corporate standard of all corporate standards. And we have MTS it is trying to peddle to simple users. Phone and phone. Operating system — its own app — very ogranichennogo list. With the Russian problem seemed to be gone, but... Full BlackBerry-Style devices of all manufacturers, from Nokia to HTC. PushMail ActiveSync on the Server (Exchange) similarly tight traffic, is able to ship the headers and not the entire mail, in the latest editions of WinMo 6.x is a very economical ate the battery, etc.
8. No, not true. As I said above, the BES needs to stand inside the DMZ, direct prirodnym to the mailer (Exchange, Lotus, etc.). Russian current implementation when the BES is at the operator's sake, more "big brother said to do so".
9. For what it's like in the USA, I wrote. I can say, for which he did not favor our corporator. (a) BES is the Opsosom to him as it is necessary to stretch to hemorrhoids. (b) All traffic from the BES is not going directly to Opseu, and swings through the Central server of BB USA. And who of our "petroleum" (for example) will want their traffic to swing through the USA, especially because the Protocol is proprietary, and parts of it no one knows except BB. "What if?" (it was still () but forgot... remember — write)