On July 26 2016 BlackBerry released "BlackBerry Enterprise Service 12 Service Pack 5a" (BES 12.5.0a) without release notes. So there was no direct way of finding out what the "a" really changed. Digging through the KB articles I found this: http://support.blackberry.com/kb/articleDetail?articleNumber=000038323 So the short answer is: The "a" fixes one specific issue that would block you from upgrading from a previous BES version to 12.5. If you already have upgraded to BES 12.5.0 successfully, Read more [...]