Updating Microsoft Outlook 365
Step 1. Open the Outlook app.
Step 2. Go to File > Account (or Office Account if you opened Outlook).
Step 3. Under Product Information, choose Update Options > Update Now.
Note: You may need to click Enable Updates first if you don't see the Update Now option right away.

Step 4. Close the "You're up to date!" window after Office is done checking for and installing updates.