BlackBerry Enterprise Server 5 Service Pack 3 has been released to the web, read the release notes here http://docs.blackberry.com/en/admin/deliverables/25750/BlackBerry_Enterprise_Server_for_Microsoft_Exchange-Release_Notes--1398168-0311101250-001-5.0.3-US.pdf.
BlackBerry Enterprise Server Express 5 Service Pack 2 Maintenance Release 5 has also been released to the web, read the release notes here http://docs.blackberry.com/en/admin/deliverables/25750/BlackBerry_Enterprise_Server_for_Microsoft_Exchange-Release_Notes--1398168-0311101250-001-5.0.3-US.pdf.
Both are available to download here, http://swdownloads.blackberry.com/Downloads/.
Updated: I forgot to add SP3 adds OCS 2007 R2 and Lync 2010 support which I blogged about last week http://blog.exchangegeek.com/2011/03/lync-ocs-r2-support-in-bes-5-sp3.html.
Daniel Noakes