Bandwidth usage email alerts calculations have an error when converting from decimal to percentage:
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site.com : Bandwidth 0.91% used
This in an automatic informational message to notify you that domain (site.com) has used 0.91% of its bandwidth allotment under your current plan.
Once you reach 100% utilization of your bandwidth your site will either be interrupted or you will incur bandwidth overage charges.
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This issue started in July(?) 2010 with an update to IW. I’m pretty sure it was fine through May, maybe June.