Outlook Disconnected From Server Windows 11 Fix [2026]

Quick Answer: Outlook disconnected because it's in Offline mode or connection failed. Click "Send/Receive" tab → uncheck "Work Offline", or restart Outlook to reconnect to Exchange server.

Symptoms

• Outlook shows "Disconnected" or "Trying to connect"
• "Work Offline" button highlighted
• Can receive but not send emails
• Status bar shows "Offline"

Root Cause

Accidental offline mode, network issues, or corrupted OST file.

Fix

Method 1: Disable Work Offline

1. Send/Receive tab → Work Offline button
2. Click to unhighlight (exit offline mode)

Method 2: Check Connection Status

Ctrl + Click Outlook tray icon → Connection Status Verify all connections show "Established"

Method 3: Repair OST File

1. File → Account Settings → Account Settings
2. Data Files tab → Open File Location
3. Close Outlook, delete/rename .ost file
4. Restart Outlook to rebuild

Method 4: Create New Profile

Control Panel → Mail → Show Profiles → Add

How Againly Helps

Againly runs check_app_cache to detect Outlook cache corruption and connection issues.

[CTA: Try free diagnosis]

Related: Teams High CPU Fix