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Old 06-28-2006, 09:12 AM   #1 (permalink)
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Exclamation MAPI problems - BES ping to Exch MX > 35ms

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My UK company has recently changed its wide area network from BT SMDS (switched, low routing protocol overhead) to a new ATM/MPLS platform (this had to be done because of SMDS switch off 31/03/06)... unfortunately, there are 4 routing protocols on the new WAN .

Shortly after this changeover, our Blackberry userbase increased from 20 (mostly execs) to 50 users.

I now find that some of these new users are getting intermittent mail delivery. Their mailboxes are stored on Exchange servers which, when pinged, can take more than 35ms to respond to the BES (25-40% of the time, not just occasionally).
The obvious decision is to move all the mailboxes to be on an Exchange server right next to the BES, but the messaging guys are protesting about this saying that this will harm the user's normal Outlook usability, causing support calls on their side of the fence ...

It seems to be a MAPI issue... MAPI works over UDP and the IETF RFC page for UDP states...

This protocol provides a procedure for application programs to send
messages to other programs with a minimum of protocol mechanism. The
protocol is transaction oriented, and delivery and duplicate protection
are not guaranteed. Applications requiring ordered reliable delivery of
streams of data should use the Transmission Control Protocol (TCP) [2].

So delivery is NOT GUARANTEED - G R E A T !!

My question to the forum is this - can MAPI be made to work over TCP (which IS resilient to non-delivery of packets) instead ?

Otherwise, is there a combination of BES 4.x service packs/hotfixes which removes this latency issue altogether so I don't have to move mailboxes.

We are currently on BES 4.0, no SPs, no HFs , with a plan to move to BES 4.0 SP4, HF 3 - does anyone know if that will help ?

Users in question are pretty senior so would appreciate it if anyone has some guidance in this area...

Thanks to the moderators for - an excellent resource - keep up the good work...

J Rose
BB administrator

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