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From what I've seen, "Direct push" is not.
The Exchange server sends and SMS message to the device and then the device uses that as a trigger to retrieve the messages from the server. (if you doubt this, set it up and then check your "text message" usage for your carrier.)
The only real "direct push" is when sending a mail from the device. Then it goes directly to the server with no interim SMS message. There is also no native Global Address Book lookup function. (I get around this by copying the GAL to my Outlook Contacts and letting that sync)
"Direct push" is also slower on the mail delivery than RIM's BES.
I run our network and we have a Blackberry Enterprise Server that has 60 Blackberries on it. Doing a test of sending and receiving messages, the Blackberry devices are always faster, sometimes by several minutes.
Direct push speed is somewhat dictated by the carrier's text message system and how fast it can get the "new mail" notification to the Windows Mobile device.
Here in the US, Verizon Windows Mobile devices come with "Wireless Sync" that does kind of what the BES does and it's free. Of course there are limitations like the lack of Global Address Book lookups.
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