So, apparently Yahoo has suffered yet another breach. A quick search of the news sites (Bing Search) would bring up more info.
Sign in to Yahoo and change the account password as soon as possible.
Then, enable Second Sign-In Verification:
We suggest using SMS as the primary method for protecting the account as opposed to the security questions.
Under Account Info:
Once the mobile is confirmed make the following setting:
This at least will provide a layer of protection unless the verification system itself also gets compromised. But, if that's the case Yahoo would probably have bigger problems on their hands! :S
While you're at it please enable 2FA (2 Factor Authentication) on all Microsoft IDs and download the Authentication App to your mobile device and _use_ it!
Now that online service providers are starting to allow us to protect ourselves with additional security steps the onus is on us to use those features!
Philip Elder
Microsoft Cluster MVP
MPECS Inc.
Co-Author: SBS 2008 Blueprint Book
Chef de partie in the SMBKitchen
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Third Tier: Enterprise Solutions for Small Business