diff --git a/x-pack/legacy/plugins/siem/public/components/timeline/insert_timeline_popover/index.tsx b/x-pack/legacy/plugins/siem/public/components/timeline/insert_timeline_popover/index.tsx
index fa474c4d601ad..cf1a4ebec9bb6 100644
--- a/x-pack/legacy/plugins/siem/public/components/timeline/insert_timeline_popover/index.tsx
+++ b/x-pack/legacy/plugins/siem/public/components/timeline/insert_timeline_popover/index.tsx
@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { EuiButtonIcon, EuiPopover, EuiSelectableOption } from '@elastic/eui';
+import { EuiButtonIcon, EuiPopover, EuiSelectableOption, EuiToolTip } from '@elastic/eui';
 import React, { memo, useCallback, useEffect, useMemo, useState } from 'react';
 import { useLocation } from 'react-router-dom';
 import { useDispatch } from 'react-redux';
@@ -62,13 +62,15 @@ export const InsertTimelinePopoverComponent: React.FC<Props> = ({
 
   const insertTimelineButton = useMemo(
     () => (
-      <EuiButtonIcon
-        aria-label={i18n.INSERT_TIMELINE}
-        data-test-subj="insert-timeline-button"
-        iconType="timeline"
-        isDisabled={isDisabled}
-        onClick={handleOpenPopover}
-      />
+      <EuiToolTip position="top" content={<p>{i18n.INSERT_TIMELINE}</p>}>
+        <EuiButtonIcon
+          aria-label={i18n.INSERT_TIMELINE}
+          data-test-subj="insert-timeline-button"
+          iconType="timeline"
+          isDisabled={isDisabled}
+          onClick={handleOpenPopover}
+        />
+      </EuiToolTip>
     ),
     [handleOpenPopover, isDisabled]
   );
diff --git a/x-pack/legacy/plugins/siem/public/components/timeline/translations.ts b/x-pack/legacy/plugins/siem/public/components/timeline/translations.ts
index de3e3c8e792fe..101837168350f 100644
--- a/x-pack/legacy/plugins/siem/public/components/timeline/translations.ts
+++ b/x-pack/legacy/plugins/siem/public/components/timeline/translations.ts
@@ -25,5 +25,5 @@ export const SEARCH_BOX_TIMELINE_PLACEHOLDER = i18n.translate(
 );
 
 export const INSERT_TIMELINE = i18n.translate('xpack.siem.insert.timeline.insertTimelineButton', {
-  defaultMessage: 'Insert Timeline…',
+  defaultMessage: 'Insert timeline link',
 });
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/translations.ts b/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
index 601db373f041e..a453be32480e2 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
+++ b/x-pack/legacy/plugins/siem/public/containers/case/translations.ts
@@ -10,6 +10,46 @@ export const ERROR_TITLE = i18n.translate('xpack.siem.containers.case.errorTitle
   defaultMessage: 'Error fetching data',
 });
 
+export const ERROR_DELETING = i18n.translate('xpack.siem.containers.case.errorDeletingTitle', {
+  defaultMessage: 'Error deleting data',
+});
+
+export const UPDATED_CASE = (caseTitle: string) =>
+  i18n.translate('xpack.siem.containers.case.updatedCase', {
+    values: { caseTitle },
+    defaultMessage: 'Updated "{caseTitle}"',
+  });
+
+export const DELETED_CASES = (totalCases: number, caseTitle?: string) =>
+  i18n.translate('xpack.siem.containers.case.deletedCases', {
+    values: { caseTitle, totalCases },
+    defaultMessage: 'Deleted {totalCases, plural, =1 {"{caseTitle}"} other {{totalCases} cases}}',
+  });
+
+export const CLOSED_CASES = ({
+  totalCases,
+  caseTitle,
+}: {
+  totalCases: number;
+  caseTitle?: string;
+}) =>
+  i18n.translate('xpack.siem.containers.case.closedCases', {
+    values: { caseTitle, totalCases },
+    defaultMessage: 'Closed {totalCases, plural, =1 {"{caseTitle}"} other {{totalCases} cases}}',
+  });
+
+export const REOPENED_CASES = ({
+  totalCases,
+  caseTitle,
+}: {
+  totalCases: number;
+  caseTitle?: string;
+}) =>
+  i18n.translate('xpack.siem.containers.case.reopenedCases', {
+    values: { caseTitle, totalCases },
+    defaultMessage: 'Reopened {totalCases, plural, =1 {"{caseTitle}"} other {{totalCases} cases}}',
+  });
+
 export const TAG_FETCH_FAILURE = i18n.translate(
   'xpack.siem.containers.case.tagFetchFailDescription',
   {
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/types.ts b/x-pack/legacy/plugins/siem/public/containers/case/types.ts
index bb215d6ac271c..cb3df78257dc1 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/types.ts
+++ b/x-pack/legacy/plugins/siem/public/containers/case/types.ts
@@ -114,3 +114,8 @@ export interface ActionLicense {
   enabledInConfig: boolean;
   enabledInLicense: boolean;
 }
+
+export interface DeleteCase {
+  id: string;
+  title?: string;
+}
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx b/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx
index f1129bae9f537..7d040c49f1971 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx
+++ b/x-pack/legacy/plugins/siem/public/containers/case/use_bulk_update_case.tsx
@@ -5,7 +5,7 @@
  */
 
 import { useCallback, useReducer } from 'react';
-import { errorToToaster, useStateToaster } from '../../components/toasters';
+import { displaySuccessToast, errorToToaster, useStateToaster } from '../../components/toasters';
 import * as i18n from './translations';
 import { patchCasesStatus } from './api';
 import { BulkUpdateStatus, Case } from './types';
@@ -71,9 +71,22 @@ export const useUpdateCases = (): UseUpdateCase => {
     const patchData = async () => {
       try {
         dispatch({ type: 'FETCH_INIT' });
-        await patchCasesStatus(cases, abortCtrl.signal);
+        const patchResponse = await patchCasesStatus(cases, abortCtrl.signal);
         if (!cancel) {
+          const resultCount = Object.keys(patchResponse).length;
+          const firstTitle = patchResponse[0].title;
+
           dispatch({ type: 'FETCH_SUCCESS', payload: true });
+          const messageArgs = {
+            totalCases: resultCount,
+            caseTitle: resultCount === 1 ? firstTitle : '',
+          };
+          const message =
+            resultCount && patchResponse[0].status === 'open'
+              ? i18n.REOPENED_CASES(messageArgs)
+              : i18n.CLOSED_CASES(messageArgs);
+
+          displaySuccessToast(message, dispatchToaster);
         }
       } catch (error) {
         if (!cancel) {
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/use_delete_cases.tsx b/x-pack/legacy/plugins/siem/public/containers/case/use_delete_cases.tsx
index b44e01d06acaf..07e3786758aeb 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/use_delete_cases.tsx
+++ b/x-pack/legacy/plugins/siem/public/containers/case/use_delete_cases.tsx
@@ -5,9 +5,10 @@
  */
 
 import { useCallback, useReducer } from 'react';
-import { errorToToaster, useStateToaster } from '../../components/toasters';
+import { displaySuccessToast, errorToToaster, useStateToaster } from '../../components/toasters';
 import * as i18n from './translations';
 import { deleteCases } from './api';
+import { DeleteCase } from './types';
 
 interface DeleteState {
   isDisplayConfirmDeleteModal: boolean;
@@ -57,9 +58,10 @@ const dataFetchReducer = (state: DeleteState, action: Action): DeleteState => {
       return state;
   }
 };
+
 interface UseDeleteCase extends DeleteState {
   dispatchResetIsDeleted: () => void;
-  handleOnDeleteConfirm: (caseIds: string[]) => void;
+  handleOnDeleteConfirm: (caseIds: DeleteCase[]) => void;
   handleToggleModal: () => void;
 }
 
@@ -72,21 +74,26 @@ export const useDeleteCases = (): UseDeleteCase => {
   });
   const [, dispatchToaster] = useStateToaster();
 
-  const dispatchDeleteCases = useCallback((caseIds: string[]) => {
+  const dispatchDeleteCases = useCallback((cases: DeleteCase[]) => {
     let cancel = false;
     const abortCtrl = new AbortController();
 
     const deleteData = async () => {
       try {
         dispatch({ type: 'FETCH_INIT' });
+        const caseIds = cases.map(theCase => theCase.id);
         await deleteCases(caseIds, abortCtrl.signal);
         if (!cancel) {
           dispatch({ type: 'FETCH_SUCCESS', payload: true });
+          displaySuccessToast(
+            i18n.DELETED_CASES(cases.length, cases.length === 1 ? cases[0].title : ''),
+            dispatchToaster
+          );
         }
       } catch (error) {
         if (!cancel) {
           errorToToaster({
-            title: i18n.ERROR_TITLE,
+            title: i18n.ERROR_DELETING,
             error: error.body && error.body.message ? new Error(error.body.message) : error,
             dispatchToaster,
           });
diff --git a/x-pack/legacy/plugins/siem/public/containers/case/use_update_case.tsx b/x-pack/legacy/plugins/siem/public/containers/case/use_update_case.tsx
index 85ad4fd3fc47a..4973deef4d91a 100644
--- a/x-pack/legacy/plugins/siem/public/containers/case/use_update_case.tsx
+++ b/x-pack/legacy/plugins/siem/public/containers/case/use_update_case.tsx
@@ -5,8 +5,8 @@
  */
 
 import { useReducer, useCallback } from 'react';
+import { displaySuccessToast, errorToToaster, useStateToaster } from '../../components/toasters';
 import { CasePatchRequest } from '../../../../../../plugins/case/common/api';
-import { errorToToaster, useStateToaster } from '../../components/toasters';
 
 import { patchCase } from './api';
 import * as i18n from './translations';
@@ -94,6 +94,7 @@ export const useUpdateCase = ({ caseId }: { caseId: string }): UseUpdateCase =>
             updateCase(response[0]);
           }
           dispatch({ type: 'FETCH_SUCCESS' });
+          displaySuccessToast(i18n.UPDATED_CASE(response[0].title), dispatchToaster);
         }
       } catch (error) {
         if (!cancel) {
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.test.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.test.tsx
index bdcb87b483851..5f61ccf68fc86 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.test.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.test.tsx
@@ -202,7 +202,7 @@ describe('AllCases', () => {
       .last()
       .simulate('click');
     expect(handleOnDeleteConfirm.mock.calls[0][0]).toStrictEqual(
-      useGetCasesMockState.data.cases.map(theCase => theCase.id)
+      useGetCasesMockState.data.cases.map(({ id }) => ({ id }))
     );
   });
   it('Bulk close status update', () => {
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx
index 27316ab8427cb..dcfa1712c6ef9 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/all_cases/index.tsx
@@ -21,7 +21,7 @@ import styled, { css } from 'styled-components';
 import * as i18n from './translations';
 
 import { getCasesColumns } from './columns';
-import { Case, FilterOptions, SortFieldCase } from '../../../../containers/case/types';
+import { Case, DeleteCase, FilterOptions, SortFieldCase } from '../../../../containers/case/types';
 import { useGetCases, UpdateCase } from '../../../../containers/case/use_get_cases';
 import { useGetCasesStatus } from '../../../../containers/case/use_get_cases_status';
 import { useDeleteCases } from '../../../../containers/case/use_delete_cases';
@@ -107,11 +107,24 @@ export const AllCases = React.memo(() => {
     isDisplayConfirmDeleteModal,
   } = useDeleteCases();
 
-  const { dispatchResetIsUpdated, isUpdated, updateBulkStatus } = useUpdateCases();
+  // Update case
+  const {
+    dispatchResetIsUpdated,
+    isLoading: isUpdating,
+    isUpdated,
+    updateBulkStatus,
+  } = useUpdateCases();
+  const [deleteThisCase, setDeleteThisCase] = useState({
+    title: '',
+    id: '',
+  });
+  const [deleteBulk, setDeleteBulk] = useState<DeleteCase[]>([]);
 
   const refreshCases = useCallback(() => {
     refetchCases(filterOptions, queryParams);
     fetchCasesStatus();
+    setSelectedCases([]);
+    setDeleteBulk([]);
   }, [filterOptions, queryParams]);
 
   useEffect(() => {
@@ -124,11 +137,6 @@ export const AllCases = React.memo(() => {
       dispatchResetIsUpdated();
     }
   }, [isDeleted, isUpdated]);
-  const [deleteThisCase, setDeleteThisCase] = useState({
-    title: '',
-    id: '',
-  });
-  const [deleteBulk, setDeleteBulk] = useState<string[]>([]);
   const confirmDeleteModal = useMemo(
     () => (
       <ConfirmDeleteCaseModal
@@ -138,7 +146,7 @@ export const AllCases = React.memo(() => {
         onCancel={handleToggleModal}
         onConfirm={handleOnDeleteConfirm.bind(
           null,
-          deleteBulk.length > 0 ? deleteBulk : [deleteThisCase.id]
+          deleteBulk.length > 0 ? deleteBulk : [deleteThisCase]
         )}
       />
     ),
@@ -150,10 +158,20 @@ export const AllCases = React.memo(() => {
     setDeleteThisCase(deleteCase);
   }, []);
 
-  const toggleBulkDeleteModal = useCallback((deleteCases: string[]) => {
-    handleToggleModal();
-    setDeleteBulk(deleteCases);
-  }, []);
+  const toggleBulkDeleteModal = useCallback(
+    (caseIds: string[]) => {
+      handleToggleModal();
+      if (caseIds.length === 1) {
+        const singleCase = selectedCases.find(theCase => theCase.id === caseIds[0]);
+        if (singleCase) {
+          return setDeleteThisCase({ id: singleCase.id, title: singleCase.title });
+        }
+      }
+      const convertToDeleteCases: DeleteCase[] = caseIds.map(id => ({ id }));
+      setDeleteBulk(convertToDeleteCases);
+    },
+    [selectedCases]
+  );
 
   const handleUpdateCaseStatus = useCallback(
     (status: string) => {
@@ -289,7 +307,7 @@ export const AllCases = React.memo(() => {
           </EuiFlexItem>
         </EuiFlexGroup>
       </CaseHeaderPage>
-      {(isCasesLoading || isDeleting) && !isDataEmpty && (
+      {(isCasesLoading || isDeleting || isUpdating) && !isDataEmpty && (
         <ProgressLoader size="xs" color="accent" className="essentialAnimation" />
       )}
       <Panel loading={isCasesLoading}>
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.test.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.test.tsx
index 1be0d6a3b5fcc..49f5f44cba271 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.test.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.test.tsx
@@ -60,6 +60,6 @@ describe('CaseView actions', () => {
 
     expect(wrapper.find('[data-test-subj="confirm-delete-case-modal"]').exists()).toBeTruthy();
     wrapper.find('button[data-test-subj="confirmModalConfirmButton"]').simulate('click');
-    expect(handleOnDeleteConfirm.mock.calls[0][0]).toEqual([data.id]);
+    expect(handleOnDeleteConfirm.mock.calls[0][0]).toEqual([{ id: data.id, title: data.title }]);
   });
 });
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.tsx
index 1d90470eab0e1..04b79967aa36e 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/case_view/actions.tsx
@@ -34,7 +34,7 @@ const CaseViewActionsComponent: React.FC<CaseViewActions> = ({ caseData }) => {
         isModalVisible={isDisplayConfirmDeleteModal}
         isPlural={false}
         onCancel={handleToggleModal}
-        onConfirm={handleOnDeleteConfirm.bind(null, [caseData.id])}
+        onConfirm={handleOnDeleteConfirm.bind(null, [{ id: caseData.id, title: caseData.title }])}
       />
     ),
     [isDisplayConfirmDeleteModal, caseData]
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/translations.ts b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/translations.ts
index 0ca6bcff513fc..066145f7762c9 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/translations.ts
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/translations.ts
@@ -22,13 +22,13 @@ export const REQUIRED_UPDATE_TO_SERVICE = i18n.translate(
   }
 );
 
-export const COPY_LINK_COMMENT = i18n.translate('xpack.siem.case.caseView.copyCommentLinkAria', {
-  defaultMessage: 'click to copy comment link',
+export const COPY_REFERENCE_LINK = i18n.translate('xpack.siem.case.caseView.copyCommentLinkAria', {
+  defaultMessage: 'Copy reference link',
 });
 
 export const MOVE_TO_ORIGINAL_COMMENT = i18n.translate(
   'xpack.siem.case.caseView.moveToCommentAria',
   {
-    defaultMessage: 'click to highlight the reference comment',
+    defaultMessage: 'Highlight the referenced comment',
   }
 );
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx
index cc36e791e35b4..340e24e8fa55b 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_item.tsx
@@ -154,6 +154,7 @@ export const UserActionItem = ({
                 labelQuoteAction={labelQuoteAction}
                 labelTitle={labelTitle ?? <></>}
                 linkId={linkId}
+                fullName={fullName}
                 username={username}
                 updatedAt={updatedAt}
                 onEdit={onEdit}
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_title.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_title.tsx
index 94185cb4d130c..af1a1fdff26ce 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_title.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/user_action_tree/user_action_title.tsx
@@ -4,7 +4,14 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { EuiLoadingSpinner, EuiFlexGroup, EuiFlexItem, EuiText, EuiButtonIcon } from '@elastic/eui';
+import {
+  EuiLoadingSpinner,
+  EuiFlexGroup,
+  EuiFlexItem,
+  EuiText,
+  EuiButtonIcon,
+  EuiToolTip,
+} from '@elastic/eui';
 import { FormattedRelative } from '@kbn/i18n/react';
 import copy from 'copy-to-clipboard';
 import { isEmpty } from 'lodash/fp';
@@ -33,6 +40,7 @@ interface UserActionTitleProps {
   labelQuoteAction?: string;
   labelTitle: JSX.Element;
   linkId?: string | null;
+  fullName?: string | null;
   updatedAt?: string | null;
   username: string;
   onEdit?: (id: string) => void;
@@ -48,6 +56,7 @@ export const UserActionTitle = ({
   labelQuoteAction,
   labelTitle,
   linkId,
+  fullName,
   username,
   updatedAt,
   onEdit,
@@ -105,7 +114,9 @@ export const UserActionTitle = ({
         <EuiFlexItem grow={false}>
           <EuiFlexGroup alignItems="baseline" gutterSize="xs" component="span">
             <EuiFlexItem grow={false}>
-              <strong>{username}</strong>
+              <EuiToolTip position="top" content={<p>{fullName ?? username}</p>}>
+                <strong>{username}</strong>
+              </EuiToolTip>
             </EuiFlexItem>
             <EuiFlexItem grow={false}>{labelTitle}</EuiFlexItem>
             <EuiFlexItem grow={false}>
@@ -137,20 +148,24 @@ export const UserActionTitle = ({
           <EuiFlexGroup alignItems="baseline" gutterSize="none">
             {!isEmpty(linkId) && (
               <EuiFlexItem grow={false}>
-                <EuiButtonIcon
-                  aria-label={i18n.MOVE_TO_ORIGINAL_COMMENT}
-                  onClick={handleMoveToLink}
-                  iconType="arrowUp"
-                />
+                <EuiToolTip position="top" content={<p>{i18n.MOVE_TO_ORIGINAL_COMMENT}</p>}>
+                  <EuiButtonIcon
+                    aria-label={i18n.MOVE_TO_ORIGINAL_COMMENT}
+                    onClick={handleMoveToLink}
+                    iconType="arrowUp"
+                  />
+                </EuiToolTip>
               </EuiFlexItem>
             )}
             <EuiFlexItem grow={false}>
-              <EuiButtonIcon
-                aria-label={i18n.COPY_LINK_COMMENT}
-                onClick={handleAnchorLink}
-                iconType="link"
-                id={`${id}-permLink`}
-              />
+              <EuiToolTip position="top" content={<p>{i18n.COPY_REFERENCE_LINK}</p>}>
+                <EuiButtonIcon
+                  aria-label={i18n.COPY_REFERENCE_LINK}
+                  onClick={handleAnchorLink}
+                  iconType="link"
+                  id={`${id}-permLink`}
+                />
+              </EuiToolTip>
             </EuiFlexItem>
             {propertyActions.length > 0 && (
               <EuiFlexItem grow={false}>
diff --git a/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx b/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx
index 3109f2382c362..87a446c45d891 100644
--- a/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx
+++ b/x-pack/legacy/plugins/siem/public/pages/case/components/user_list/index.tsx
@@ -13,6 +13,7 @@ import {
   EuiFlexGroup,
   EuiFlexItem,
   EuiLoadingSpinner,
+  EuiToolTip,
 } from '@elastic/eui';
 import styled, { css } from 'styled-components';
 import { ElasticUser } from '../../../../containers/case/types';
@@ -40,8 +41,8 @@ const MyFlexGroup = styled(EuiFlexGroup)`
 const renderUsers = (
   users: ElasticUser[],
   handleSendEmail: (emailAddress: string | undefined | null) => void
-) => {
-  return users.map(({ fullName, username, email }, key) => (
+) =>
+  users.map(({ fullName, username, email }, key) => (
     <MyFlexGroup key={key} justifyContent="spaceBetween">
       <EuiFlexItem grow={false}>
         <EuiFlexGroup gutterSize="xs">
@@ -49,11 +50,13 @@ const renderUsers = (
             <MyAvatar name={fullName ? fullName : username} />
           </EuiFlexItem>
           <EuiFlexItem>
-            <p>
-              <strong>
-                <small data-test-subj="case-view-username">{username}</small>
-              </strong>
-            </p>
+            <EuiToolTip position="top" content={<p>{fullName ?? username}</p>}>
+              <p>
+                <strong>
+                  <small data-test-subj="case-view-username">{username}</small>
+                </strong>
+              </p>
+            </EuiToolTip>
           </EuiFlexItem>
         </EuiFlexGroup>
       </EuiFlexItem>
@@ -63,11 +66,11 @@ const renderUsers = (
           onClick={handleSendEmail.bind(null, email)}
           iconType="email"
           aria-label="email"
+          isDisabled={email == null}
         />
       </EuiFlexItem>
     </MyFlexGroup>
   ));
-};
 
 export const UserList = React.memo(({ email, headline, loading, users }: UserListProps) => {
   const handleSendEmail = useCallback(