Wolfgang Kandek, CTO of Qualys confirmed that the highest priority patch is MS15-097 , which includes critical bug fixes for Windows Vista, Windows Server 2008, Microsoft Office 2007 and 2010, and Lync 2007, 2010, and 2013.
Talking about bugs, there was a Win32k memory leak, named CVE -2015-2546 found in all versions of window was deemed important and discussed in open. One of the other flaws was CVE-2015-2545, a microsoft Office malformed EPS file. This bug allowed remote code execution and has been fixed in bulletin MS15-099 along with other bug fixes.
Other bulletins that has bug fixes have been released , namely MS15-094 through MS15-103 . MS15-094 addresses all the issues regarding browsers ,that is vulnerability in internet explorer and Edge browser has been fixed in this bulletin . MS15-098 bulletin addresses remote code execution for journal bug , MS15-103 addresses problems in exchange servers like microsoft outlook .