We migrated all of our users from Exchange 2007 to Exchange 2013 (two servers load balanced Microsoft failover with 1 DAG) and it went well. No issues for users using Outlook 2013 and OWA. However, as soon as we moved our Blackberry users (all Z30 Blackberry 10 version 10.3.3.1463) to the new Exchange 2013 and repointed the BES server to the new Exchange 2013 (new mail profile, but the same issues if we just repoint the old profile to the new IP) their Blackberry devices (connected to a single Blackberry Server Version 12.5.1) started acting odd and did not receive or send email anymore from their Z30 devices. We had to generate and export a BES certificate to the new Exchange 2013 and vice versa for mail to flow. However, then we noticed that users who had their Blackberry off during the migration could not get email. Only users who were ON and connected (to Blackberry) throughout the entire migration process could continue to send/receive email from their Z30’s. Anyone who restarted their Z30 or changed their network password (the one specified on the Z30) or if we try to deploy (using the standard process via the BES -> create account, send verification code, etc.) a new Z30 we run into the same no email issue. During the deployment the entire process from the Bes to the Z30 works and a workspace is created (visible and can be used) without issues, just like before, but when you get to the last item (when you enter the network password for the user so it can authenticate and download emails, calendar, etc.) it fails with the error shown hereafter. The 2007 Exchange did not have these issues and I can only speculate that it is an ActiveSync related authentication issue in that something is preventing the password from being transmitted successfully. Any users who restarts their Z30 also drops off and no longer gets email. We have tried with ISP (Rogers) connection, internal Wi-Fi, new users, existing users but to no avail. Some users continue to be able send/receive
“The server for account activesync : work firstname.lastname@example.org (172.20.1.9, port: 443) can't be reached. The settings might be incorrect or the server could temporarily offline. Check your settings and try again.”
Please help as all BB users are Executive team members!!!