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But in case your computer is not permanently connected to the Internet or if you haven’t turned it on for a longer period of time, you should consider either forcing an update or manually updating the latest updates. Of course, you could just leave Microsoft Security Essentials to update its definitions on its own and, obviously, it is advisable you do so. Keeping Microsoft Security Essentials up-to-date ensures that your computer is protected at all times and that the latest viruses and spyware variations will be detected during scanning. Link leads to MSE 4.9 as of April 15, 2016.The Microsoft Security Essentials Definition Updates deploys a package containing the latest virus signatures for the latest release of Microsoft Security Essentials. The previous version can be downloaded from. If I decide to install 4.9, I will post here about any changes in the GUI. I have checked Seven Forums, but so far there are no reports similar to yours. Since you have experienced difficulty with the update, I have decided to delay installing it for now.
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As far as I know, no independent lab has conducted tests featuring Windows Defender 4.9 yet. Interestingly, the Engine Version (0.0) and Network Inspection Engine Version (4.0) are exactly the same as MSE 4.8, which seems to suggest that 4.9 is not a major advance. I have found that Windows Defender for 8 and 10 - which by all accounts is almost identical to MSE - received an update 6.0 at least 3 months ago. On the other hand, the previous version 4.8.204.0 (KB3063917, May 2015) was recognized as a tremendous improvement (see ).
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On the one hand, it is generally a good idea to keep security software up to date. As you have found, Microsoft does not post documentation for MSE updates.
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Your post last night was the first I heard of this program update for MSE.
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