diff --git a/packages/app-store/office365calendar/lib/CalendarService.ts b/packages/app-store/office365calendar/lib/CalendarService.ts
index 848e4334..2d1827e0 100644
--- a/packages/app-store/office365calendar/lib/CalendarService.ts
+++ b/packages/app-store/office365calendar/lib/CalendarService.ts
@@ -107,9 +107,9 @@ export default class Office365CalendarService implements Calendar {
     const dateFromParsed = new Date(dateFrom);
     const dateToParsed = new Date(dateTo);
 
-    const filter = `?startdatetime=${encodeURIComponent(
+    const filter = `?startDateTime=${encodeURIComponent(
       dateFromParsed.toISOString()
-    )}&enddatetime=${encodeURIComponent(dateToParsed.toISOString())}`;
+    )}&endDateTime=${encodeURIComponent(dateToParsed.toISOString())}`;
     return (await this.auth)
       .getToken()
       .then(async (accessToken) => {
@@ -142,12 +142,14 @@ export default class Office365CalendarService implements Calendar {
         return responseBody.responses.reduce(
           (acc: BufferedBusyTime[], subResponse: { body: { value: any[] } }) =>
             acc.concat(
-              subResponse.body.value.map((evt) => {
-                return {
-                  start: evt.start.dateTime + "Z",
-                  end: evt.end.dateTime + "Z",
-                };
-              })
+              subResponse.body.value
+                .filter((evt) => evt.showAs !== "free" && evt.showAs !== "workingElsewhere")
+                .map((evt) => {
+                  return {
+                    start: evt.start.dateTime + "Z",
+                    end: evt.end.dateTime + "Z",
+                  };
+                })
             ),
           []
         );
diff --git a/packages/types/Calendar.d.ts b/packages/types/Calendar.d.ts
index 57f8386f..45bd1e0d 100644
--- a/packages/types/Calendar.d.ts
+++ b/packages/types/Calendar.d.ts
@@ -60,7 +60,13 @@ export type BatchResponse = {
 };
 
 export type SubResponse = {
-  body: { value: { start: { dateTime: string }; end: { dateTime: string } }[] };
+  body: {
+    value: {
+      showAs: "free" | "tentative" | "away" | "busy" | "workingElsewhere";
+      start: { dateTime: string };
+      end: { dateTime: string };
+    }[];
+  };
 };
 
 export interface ConferenceData {