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From BotBuilder

This new iteration of Teams SDK has been rebuilt from the ground up. To ease the migration process, the Microsoft.Teams.Apps.BotBuilder package provides BotFramework adapter compatibility that allows you to continue using BotBuilder components like ActivityHandler and CloudAdapter to receive, process and send activities within the new Teams SDK abstractions.

.NET SDK version
  • SDK 2.0 — use the plugin package Microsoft.Teams.Plugins.AspNetCore.BotBuilder.
  • SDK 2.1 — use Microsoft.Teams.Apps.BotBuilder with AddTeamsBotFrameworkHttpAdapter(). This is the recommended path for new and migrating C# apps.