Microsoft is to cover 34 vulnerabilities in ten bulletins for next week's Patch Tuesday, with six critical issues covered.

Jerry Bryant, group manager of response communications at Microsoft, said that six of the bulletins affect Windows and of those, two carry a critical severity rating and four are rated important. Two bulletins both with a severity rating of important affect Microsoft Office, while one bulletin, again with a severity rating of important, affects both Windows and Office. Finally one bulletin with a severity rating of critical affects Internet Explorer.

Wolfgang Kandek, CTO of Qualys, said: “The June release is a large update and will keep system administrators busy, even if they have migrated to Windows 7 already. Microsoft will also address two currently open vulnerabilities in SharePoint (detailed in advisory KB983438) and an information leakage in Internet Explorer, explained in advisory KB980088.”

Alan Bentley, VP international at Lumension, said: “It might be summertime but there's no sunshine expected from Microsoft next Tuesday. The impact will be felt enterprise-wide, with bulletins covering a large portion of Microsoft's range of operating systems and Windows and Office products, so it is strongly suggested that IT administrators plan ahead and prioritise this patch load as soon as possible.”

Bryant also said that support for Windows 2000 and Windows XP SP2 will end after 13th July, and recommended customers upgrade to either a supported operating system or the latest service pack in order to keep receiving necessary security updates.