Exchange ActiveSync / Mobile messaging queries
Posted on 2013-01-19
Our environment is Exchange 2010 SP1 and BES 5.0.2
We are looking at upgrading to BES10 later once it's released and also other mobile email products to cater for iPhone users.
I understand that BES10 and most mobile email applications are going to use ActiveSync to synchronise email, rather than MAPI.
I'm not familiar with AS did some reading up although still had some questions:
i. With BES, the standard advise was that the latency between the BES server and the mailbox server should be minimised, certainly no more than 35ms. Does ActiveSync have the same limitations, would we still need to place the BES account this close to the mailbox? Certainly, that's what we'd do, but I was wondering what the latency requirements for ActiveSync were.
ii. ActiveSync is described as being true "push" email in the same way Blackberry currently is. Ignoring Blackberry for the moment, how does an ActiveSync client currently have email pushed to it? With MAPI, there was the MAPI notification system that sent a UDP packet which meant that the client would initiate a response to the server requesting the message....how does ActiveSync work on mobile devices? How does Exchange know it's there in the first place and when to send a message to it? Is the connection "always on" as in MAPI?
iii. Would it be correct to say that ActiveSync is just a protocol, and independent vendors can choose to implement their own variation of it? So how an Exchange native ActiveSync client like Windows Mobile behaves, could be completely different to a 3rd party one?