I started this thread in the 365 support forums: http://community.office365.com/en-us/forums/154/t/91868.aspx
Gradually over the past 6 months users are unable to access Sharepoint using Internet Explorer. Win7, WinXP, various versions of IE but mostly 8 and 9. The Lobby will flash on the screen for a moment, then a 404 error will pop up. I called 365 support and
after hours of troubleshooting (cookies, cache, disabling add-ins, compatibility mode, etc), I ended up with "It must be your systems," and that's it.
The Sharepoint sites work just fine in Firefox. So I've had to install FF on all the machines and discourage using IE for anything other than some specific sites that don't work well with anything else. (I hate having to create browser-specific shortcuts
for users.) Reading around the web, I find this isn't a unique situation. In fact, I'm seeing people report the same thing in SP 2010 onsite servers as well.
Can someone give me some more ideas here?
Thanks!
Don