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Not supported by SBC SWe Lite in this release.

Our Lync Front End (FE) server is already running Lync CU4, and our SB Edge Lync SBA is still running CU2. Can the Lync SBA be upgraded from Lync CU2 directly to CU4 or does it need to be upgraded to CU3 first then CU4?

The latest Cumulative Updates (CU) for Lync Server contains all previous CUs. It is safe to apply the CU directly without having to increment through each one.