I got my fully loaded MBA and ACD 4 months ago and LOVE IT. It is my only machine and it does everything I need (web, PDF, create & edit Power Point and Word documents). BUT, the MS Office is a headache. My biggest problem is that when I open and edit a 100-500 page Word document (<100MB on the disk), over a few hours, it continually balloons and swells up to 2GB of system memory for Word + more than 1-1.5G of "active memory" (I have 4GB) and ultimately crashes, losing some of my most recent work. This has happened on a number of documents, even smaller ones. I have spoken at length to Apple and Microsoft but I have gotten no satisfactory diagnosis or treatment for the problem. Microsoft just suggested that I turn off all of their useful features, like track changes, spell check, auto save, etc. I have worked on similar size documents in Windows on my PC and never had this problem. So, overall, the MBA has handled anything I can throw at it EXCEPT editing larger Word documents. Any idea of what is going on here?