He had the same issue until we moved up to BES 4.0 SP2.
BES 4.0 and BES 4.0 SP1 (and your version BES 3.6) certainly had the issue.
But we also moved a number of VIP users from remote Exchange servers to Exchange servers co-located on the same LAN as the BES servers.
Originally Posted by bkw
Hey all, hoping someone may be able to assist or shed some light into a situation we're having.
We have Exchange servers clustered globally, and behind every bridgehead server we have at least one BES 3.6 server.
Whenever we perform a DR test and knock out one of the Exchange clusters, the performance of Blackberries worsens considerably.
We have exchange servers located in Chicago, NY and LA. We have BES boxes in each of these locations. We isolate Chicago, thus taking down Chicago's exchange and bes servers. What we're experiencing is that users (Handheld @ 4.0) on the LA and NY BES are seeing delays of up to 4-6 hours per 24 hours of site isolation! If we isolate a site for a weekend (48 hours), our users on the NY and LA BES have seen outages of 12 hours or more.
And yes, once everything is brought back up, mail routes normally and quickly.
Anyone else see anything like this? We've contacted RIM, and they seem dumbfounded.