Today is the day, Server 2003 is no longer supported by Microsoft, at least not without a payment of $600 per server to extend coverage.  No more patches for exploits nor will Microsoft technicians be interested in your high priority requests for help with issues.  For many companies it will be business as usual while the IT departments seek out third party tools to help prevent the inevitable infections which will start to take down entire infrastructures.  Sadly the cries of 'I told you so' will fall on deaf ears and cost many a job as executives who can't bear the idea of using a smartphone more than one year old fail to comprehend a 12 year old server OS is a bad thing.  As The Inquirer points out, Microsoft is not entirely free from blame here, they have failed to produce Server 2016 at this point and unless you want to move to Azure you would have to upgrade to other versions slated start their end in less than three years.

For users of another deprecated OS, Windows XP, you will no longer be receiving Malicious Software Removal Tool updates.  While you should not be relying solely on that product for your security it is a layer of defense you can no longer count on.  For the 12% of PCs that still run WinXP across the globe, you should be considering an upgrade and as Scott pointed out you have little time left to grab a preview of Windows 10 to test before its release.  Microsoft representatives claim there is no coincidence that it ended on the same day Server 2003 and that this particular decison was made a year ago.

"Other reasons for the lack of urgency have included the delay to Server 2016, which should have been released by now, and the austere times making for a 'mend and make do' mentality."

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