A back door installed though the recently patched flaws in Microsoft’s email software has affected over 20,000 U.S. firms, many others in Asia and Europe. The credit unions, town govt and small businesses have been put in a vulnerable position and susceptible to a hack. Those affected appear run web versions of email client Outlook and host them on their machines, instead of cloud providers. Even though Microsoft has issued emergency patches, hacks are still on the rise.

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