diff --git a/src/vs/platform/telemetry/common/telemetry.ts b/src/vs/platform/telemetry/common/telemetry.ts
index 1acf9259110..051557ebb63 100644
--- a/src/vs/platform/telemetry/common/telemetry.ts
+++ b/src/vs/platform/telemetry/common/telemetry.ts
@@ -12,6 +12,7 @@ export interface ITelemetryInfo {
 	sessionId: string;
 	machineId: string;
 	instanceId: string;
+	firstSessionDate: string;
 	msftInternal?: boolean;
 }
 
diff --git a/src/vs/platform/telemetry/common/telemetryService.ts b/src/vs/platform/telemetry/common/telemetryService.ts
index 07f2a795a2b..f30cde48b64 100644
--- a/src/vs/platform/telemetry/common/telemetryService.ts
+++ b/src/vs/platform/telemetry/common/telemetryService.ts
@@ -105,9 +105,10 @@ export class TelemetryService implements ITelemetryService {
 		let sessionId = values['sessionID'];
 		let instanceId = values['common.instanceId'];
 		let machineId = values['common.machineId'];
+		let firstSessionDate = values['common.firstSessionDate'];
 		let msftInternal = values['common.msftInternal'];
 
-		return { sessionId, instanceId, machineId, msftInternal };
+		return { sessionId, instanceId, machineId, firstSessionDate, msftInternal };
 	}
 
 	dispose(): void {
diff --git a/src/vs/platform/telemetry/common/telemetryUtils.ts b/src/vs/platform/telemetry/common/telemetryUtils.ts
index c3d103335bd..ae7180d241e 100644
--- a/src/vs/platform/telemetry/common/telemetryUtils.ts
+++ b/src/vs/platform/telemetry/common/telemetryUtils.ts
@@ -35,7 +35,8 @@ export const NullTelemetryService = new class implements ITelemetryService {
 		return Promise.resolve({
 			instanceId: 'someValue.instanceId',
 			sessionId: 'someValue.sessionId',
-			machineId: 'someValue.machineId'
+			machineId: 'someValue.machineId',
+			firstSessionDate: 'someValue.firstSessionDate'
 		});
 	}
 };
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 13fc8277203..daa743c3888 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -2166,6 +2166,11 @@ declare module 'vscode' {
 
 	export interface ExtensionContext {
 		readonly extensionRuntime: ExtensionRuntime;
+
+		/**
+		 * Indicates that this is a fresh install of VS Code.
+		 */
+		readonly isNewInstall: boolean;
 	}
 
 	//#endregion
diff --git a/src/vs/workbench/api/common/extHostExtensionService.ts b/src/vs/workbench/api/common/extHostExtensionService.ts
index 47641e7993c..56fb1c262be 100644
--- a/src/vs/workbench/api/common/extHostExtensionService.ts
+++ b/src/vs/workbench/api/common/extHostExtensionService.ts
@@ -388,6 +388,7 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 		const extensionMode = extensionDescription.isUnderDevelopment
 			? (this._initData.environment.extensionTestsLocationURI ? ExtensionMode.Test : ExtensionMode.Development)
 			: ExtensionMode.Production;
+		const installAge = Date.now() - new Date(this._initData.telemetryInfo.firstSessionDate).getTime();
 
 		this._logService.trace(`ExtensionService#loadExtensionContext ${extensionDescription.identifier.value}`);
 
@@ -424,6 +425,10 @@ export abstract class AbstractExtHostExtensionService extends Disposable impleme
 					checkProposedApiEnabled(extensionDescription);
 					return that.extensionRuntime;
 				},
+				get isNewInstall() {
+					checkProposedApiEnabled(extensionDescription);
+					return isNaN(installAge) ? false : installAge < 1000 * 60 * 60 * 24; // installAge is less than a day;
+				},
 				get environmentVariableCollection() { return that._extHostTerminalService.getEnvironmentVariableCollection(extensionDescription); }
 			});
 		});
diff --git a/src/vs/workbench/electron-sandbox/sandbox.simpleservices.ts b/src/vs/workbench/electron-sandbox/sandbox.simpleservices.ts
index fb480250176..03249aa685f 100644
--- a/src/vs/workbench/electron-sandbox/sandbox.simpleservices.ts
+++ b/src/vs/workbench/electron-sandbox/sandbox.simpleservices.ts
@@ -459,7 +459,8 @@ class SimpleTelemetryService implements ITelemetryService {
 		return {
 			instanceId: 'someValue.instanceId',
 			sessionId: 'someValue.sessionId',
-			machineId: 'someValue.machineId'
+			machineId: 'someValue.machineId',
+			firstSessionDate: 'someValue.firstSessionDate'
 		};
 	}
 }
diff --git a/src/vs/workbench/test/electron-browser/textsearch.perf.integrationTest.ts b/src/vs/workbench/test/electron-browser/textsearch.perf.integrationTest.ts
index 8a199b024d7..226ab14a9ae 100644
--- a/src/vs/workbench/test/electron-browser/textsearch.perf.integrationTest.ts
+++ b/src/vs/workbench/test/electron-browser/textsearch.perf.integrationTest.ts
@@ -202,7 +202,8 @@ class TestTelemetryService implements ITelemetryService {
 		return Promise.resolve({
 			instanceId: 'someValue.instanceId',
 			sessionId: 'someValue.sessionId',
-			machineId: 'someValue.machineId'
+			machineId: 'someValue.machineId',
+			firstSessionDate: 'someValue.firstSessionDate'
 		});
 	}
 }