diff --git a/frontend/services/dto/task-recurrence.ts b/frontend/services/dto/task-recurrence.ts
new file mode 100644
index 0000000..66c94c8
--- /dev/null
+++ b/frontend/services/dto/task-recurrence.ts
@@ -0,0 +1,22 @@
+export type TaskRecurrence = {
+    id: number
+    '@id'?: string
+    type: 'daily' | 'weekly' | 'monthly' | 'yearly'
+    interval: number
+    daysOfWeek: string[] | null
+    dayOfMonth: number | null
+    weekOfMonth: number | null
+    endDate: string | null
+    maxOccurrences: number | null
+    occurrenceCount: number
+}
+
+export type TaskRecurrenceWrite = {
+    type: 'daily' | 'weekly' | 'monthly' | 'yearly'
+    interval: number
+    daysOfWeek?: string[] | null
+    dayOfMonth?: number | null
+    weekOfMonth?: number | null
+    endDate?: string | null
+    maxOccurrences?: number | null
+}
diff --git a/frontend/services/dto/task.ts b/frontend/services/dto/task.ts
index abc1374..467db8f 100644
--- a/frontend/services/dto/task.ts
+++ b/frontend/services/dto/task.ts
@@ -29,6 +29,23 @@ export type Task = {
         status: string
         title: string
     } | null
+    scheduledStart: string | null
+    scheduledEnd: string | null
+    deadline: string | null
+    syncToCalendar: boolean
+    calendarSyncError: string | null
+    recurrence: {
+        id: number
+        '@id'?: string
+        type: 'daily' | 'weekly' | 'monthly' | 'yearly'
+        interval: number
+        daysOfWeek: string[] | null
+        dayOfMonth: number | null
+        weekOfMonth: number | null
+        endDate: string | null
+        maxOccurrences: number | null
+        occurrenceCount: number
+    } | null
 }
 
 export type TaskWrite = {
@@ -43,4 +60,9 @@ export type TaskWrite = {
     tags: string[]
     archived?: boolean
     clientTicket?: string | null
+    scheduledStart?: string | null
+    scheduledEnd?: string | null
+    deadline?: string | null
+    syncToCalendar?: boolean
+    recurrence?: string | null
 }
diff --git a/frontend/services/dto/zimbra.ts b/frontend/services/dto/zimbra.ts
new file mode 100644
index 0000000..7565252
--- /dev/null
+++ b/frontend/services/dto/zimbra.ts
@@ -0,0 +1,19 @@
+export type ZimbraSettings = {
+    serverUrl: string | null
+    username: string | null
+    calendarPath: string | null
+    enabled: boolean
+    hasPassword: boolean
+}
+
+export type ZimbraSettingsWrite = {
+    serverUrl: string | null
+    username: string | null
+    calendarPath: string | null
+    password?: string | null
+    enabled: boolean
+}
+
+export type ZimbraTestResult = {
+    success: boolean
+}
diff --git a/frontend/services/task-recurrences.ts b/frontend/services/task-recurrences.ts
new file mode 100644
index 0000000..237b145
--- /dev/null
+++ b/frontend/services/task-recurrences.ts
@@ -0,0 +1,25 @@
+import type { TaskRecurrence, TaskRecurrenceWrite } from './dto/task-recurrence'
+
+export function useTaskRecurrenceService() {
+    const api = useApi()
+
+    async function create(payload: TaskRecurrenceWrite): Promise<TaskRecurrence> {
+        return api.post<TaskRecurrence>('/task_recurrences', payload as Record<string, unknown>, {
+            toastSuccessKey: 'taskRecurrence.created',
+        })
+    }
+
+    async function update(id: number, payload: Partial<TaskRecurrenceWrite>): Promise<TaskRecurrence> {
+        return api.patch<TaskRecurrence>(`/task_recurrences/${id}`, payload as Record<string, unknown>, {
+            toastSuccessKey: 'taskRecurrence.updated',
+        })
+    }
+
+    async function remove(id: number): Promise<void> {
+        await api.delete(`/task_recurrences/${id}`, {}, {
+            toastSuccessKey: 'taskRecurrence.deleted',
+        })
+    }
+
+    return { create, update, remove }
+}
diff --git a/frontend/services/zimbra.ts b/frontend/services/zimbra.ts
new file mode 100644
index 0000000..f125612
--- /dev/null
+++ b/frontend/services/zimbra.ts
@@ -0,0 +1,21 @@
+import type { ZimbraSettings, ZimbraSettingsWrite, ZimbraTestResult } from './dto/zimbra'
+
+export function useZimbraService() {
+    const api = useApi()
+
+    async function getSettings(): Promise<ZimbraSettings> {
+        return api.get<ZimbraSettings>('/settings/zimbra')
+    }
+
+    async function saveSettings(payload: ZimbraSettingsWrite): Promise<ZimbraSettings> {
+        return api.put<ZimbraSettings>('/settings/zimbra', payload as Record<string, unknown>, {
+            toastSuccessKey: 'zimbra.settings.saved',
+        })
+    }
+
+    async function testConnection(): Promise<ZimbraTestResult> {
+        return api.post<ZimbraTestResult>('/settings/zimbra/test', {})
+    }
+
+    return { getSettings, saveSettings, testConnection }
+}