Google’s services are great, but definitely not perfect. To that end, I came across this set of slides in Google’s support area that gives some tips on troubleshooting Google Mail and Calendar problems.
Sometimes, problems are caused either by a brief outage in service or a Google Lab or similar add-on that has been enabled that is causing a problem. But if a Labs feature is causing the problem and you can’t even display your inbox, what then? Disabling labs can be accomplished by visiting this custom address (note the “labs=0” part at the end of the address) https://mail.google.com/a/augustana.edu/?labs=0.
Happy Google Apps-ing!