|Monthly Update||Publishing Channel||Classification||Release Schedule||What’s in it||Size|
|Windows Update (WU)||Windows Server Update Services (WSUS)||Windows Update Catalog|
|Security Only Quality Update||No||Yes||Yes||Security Updates||2 nd Tuesday of the month||Security fixes for the month||Relatively Small|
|Security Monthly Quality Rollup (or “Monthly Rollup” in short)||Yes||Yes||Yes||Security Updates||2 nd Tuesday of the month||All new security fixes for that month (the same ones included in the security-only update released at the same time), plus non-security fixes from the latest Preview Rollup as well as fixes from all previous Monthly Rollups||Starts out relatively small in October and grows month over month|
|Preview of Monthly Quality rollup (or “Preview Rollup” in short)||Yes||Yes||Yes||Updates||3 rd Tuesday of the month||Non-security updates for the month AND previous Monthly Rollups||Starts out relatively small in October and grows month over month|
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