IBM later this summer plans to release an overhauled version of its Sametime instant-messaging software that's designed to <A HREF="http://news.zdnet.com/2100-3513_22-6087893.html?tag=zdnn.alert">integrate closely with Microsoft Office applications.</A> Sametime 7.5, which will be available in about two months, will allow people to use instant-messaging features without having to leave Office applications.