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Running any signature-based antivirus without the latest definitions might lead to serious security-related problems.
Unless the latest virus definitions are installed, the anti-malware tool might fail in detecting some recent threats, which could lead to data theft and a compromised system.
Would it not make more sense, therefore, to just set the SCEP/Defender sources as MMPC first and Config Mgr second so that we can be certain that all endpoints will get definition updates no matter whether they are connected to the corporate network or not.
The only issue I can really foresee is that the internet connections in some remote sites is But, even so, we'll still have to replicate the ADR Packages to the remote DPs anyway if we used Config Mgr as a source so perhaps it's just better for us to use MMPC only? I often see clients with definitions from a couple of days back.
A number of Windows 7 and 8.1 users are encountering problems with Microsoft Security Essentials and Windows Defender.
Users are seeing their automatic anti-malware protection turned off without their knowledge and are seeing out-of-date virus definitions.
I just hope the clients will adhere to the client policy and swicth to MS Update or MMPC if Config Mgr can't be reached.
The Windows Defender Definition Updates are offline packages containing the most recent antivirus signature for Windows Defender.
Once installed, they will make sure your PC is safe from the latest known viruses, spyware, PUPs, and malicious files.
Other than that, deployment is fast, so you will have your Windows Defender updated in minutes.
I'm curious as to why many blogs advise against using MMPC as a source for definition updates.It is very important that you download and install the 32-bit release for x86 systems and the 64-bit release for x64 systems.