I was using Outlook Express 6.0 with no problems for a few months with no problems whatsoever. Several weeks ago, it started crashing (with msimm error messages) a few times a day. Based on some advice, I removed 6.0 and went back to a fresh install of OE5. Unfortunately it's made no difference. Some more symptoms...when it crashes, I can re-open it, but the inbox will not open "due to low disk space or low memory" The other boxes will open although OE won't send or receive mail. I have to reboot to get it to work properly again. FWIW, I'm running Win98 with 312K of RAM and plenty of room on my HD.