[Pikey]

We had an issue on one of our BES servers a couple of weeks ago where users were unable to send mail but could receive email messages. After reviewing the logs we have identified that this issue is linked to RIM KB13157 which recommends installing a Microsoft hotfix and adding a regkey to the BES servers. MS article A MAPI program may not obtain a referral server when the global catalog server to which the MAPI program points is shut down. What I'd like to know is if anyone else has experienced this issue, applyed the patch and did the patch need to be applied to their Exchange servers as well as the BES servers.
Thanks in advance.

[Pikey]

I logged calls with Microsoft and RIM. They both confirm that the patch has to be installed on Exchange first and then BES.