BlackBerry servers may crash unexpectedly when the server Name and Address Book (NAB) is upgraded to the new Notes/Domino 8 design or when users switch to the mail8 template. On your server console, you may see an error similar to the following:
Process E:\domino\nBES.EXE (4172/0x104C) has terminated abnormally
In addition, NSD may or may not activate. In either case, the BES task is not functioning, and BlackBerry users will be unable to receive mail.

Workaround Administrators should upgrade to the latest BES release that has Domino 8 support.

Latest version of BES for Domino is 4.1.4 MR2 - 4.1.5 will have native ND8 support.