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Yes, Calendar 6.3 (patch -44 or higher) is compatible with Convergence 2.
When you are ready to migrate to Calendar 7, you might be interested in:
Creating a Calendar Server 6 and Calendar Server 7 Coexistent Deployment
Calendar Server 6 and Calendar Server 7 Comparison and Coexistence
until the migration is complete.
If "older Calendar Server 6.3" refers to Calendar patch -44 / version 6.3-23.01 or higher, it will work with Convergence 2. Other than UI and other feature updates in Convergence 2, end users should not experience any significant difference when using the calendar. Of course, you may want to review the Release Notes for further information of What is New and any known issues or limitations.