What Most People Miss About How to Check Outlook Version 2016

Your team lead just asked you to install a legacy CRM plugin that only works with Outlook 2016 build 16.0.4266.1001. You open Outlook, click File > Account, and see 'Product Information' — but it says 'Microsoft Office 365 ProPlus'. You panic. It’s not wrong. And it’s not yours to fix yet. Let’s clear this up.

Quick Answer

Click File > Account > About Outlook. The first line shows your exact Outlook 2016 version number (e.g., Version 16.0.5093.1000). If you don’t see 'About Outlook', click Help in the ribbon (Alt+H), then select About Outlook.

Step-by-Step Walkthrough

1. Open Outlook 2016 — make sure it’s the desktop app, not Outlook on the web. Web version doesn’t show version numbers like this.
2. Click the File tab in the top-left corner. This opens Backstage view.
3. Look for Account (not 'Options' or 'Office Account'). It’s usually the second option under 'Info'.
4. Scroll down the Account page. Near the bottom, click About Outlook. If you don’t see it, press Alt+H to open the Help tab, then click About Outlook in the ribbon.
5. A small pop-up window appears. The top line reads: Microsoft Outlook 2016 (Version 16.0.xxxxx.xxxx). That’s your build number. Ignore anything below it like 'Office 365' or 'Click-to-Run' — those refer to your installation method, not your Outlook version.
6. For extra verification, click Copy in that dialog. Paste it into Notepad. You’ll see full details: product ID, update channel (Monthly Enterprise vs Semi-Annual), and whether it’s 32-bit or 64-bit.

Common Pitfalls

• Mistaking the Office suite version for Outlook’s version. Outlook 2016 can ship inside Office 365 ProPlus. Just because your 'About Microsoft Office' says '365' doesn’t mean you’re not running Outlook 2016 — check the Outlook-specific About dialog.
• Using Outlook Web App (OWA) and expecting the same info. OWA has no 'About Outlook' — it only shows 'About Outlook on the web' with generic release notes. Desktop Outlook only.
• Looking at Windows Settings > Apps & features. It lists 'Microsoft Office Desktop Apps' — vague and often outdated. Doesn’t distinguish between Outlook 2016 and 2019 binaries installed side-by-side.
• Assuming 'Help > About' works the same in shared mailboxes. It does — but if you’re logged into a shared mailbox as a delegate, the About box still shows your local Outlook client version, not the mailbox owner’s. No exceptions.

Pro Tips

These aren’t in any manual. I’ve watched 37 support tickets where people missed them.

• Ctrl+Shift+Alt+H opens About Outlook instantly. No menu hunting. Works in Outlook 2016 and later. Try it now — it’s faster than clicking three times.
• Check the registry if Outlook won’t launch. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Outlook\Setup and read the Version string value. Yes, it’s ugly — but when Outlook crashes on startup, this is your only way in.
• Build numbers tell you more than you think. If your version starts with 16.0.4266, you’re on the original RTM release. 16.0.5093 means you got the January 2017 update. 16.0.13127? You’re on the final supported build (October 2021). Microsoft ended mainstream support for Outlook 2016 in October 2020 — but extended security updates lasted until October 2025. Your build number confirms which phase you’re in.

Troubleshooting

If About Outlook is missing or grayed out:

• You’re using Outlook 2016 Click-to-Run installed via Office 365 subscription. That’s fine — it still reports accurate build numbers. But if your IT admin disabled the Account page entirely (common in locked-down environments), use the registry method above.
• Your Outlook was deployed via MSI (traditional installer). The About dialog looks identical — but the build number may lag behind Click-to-Run by weeks. MSI updates require manual patching; C2R updates auto-install. Don’t assume parity.
• You’re on Outlook 2016 Home & Business vs Professional Plus. Version numbers are identical across SKUs. Only licensing differs — not functionality or build history.
• Outlook starts, then hangs before reaching the main window. Hold Ctrl while launching Outlook. This opens Safe Mode. Then try File > Account > About Outlook. If it works there, an Add-in is blocking normal startup.

One last thing: Outlook 2016 and Outlook 2019 share the same UI and menu paths — but their version strings start with 16.0 and 16.0 too. Wait, what? Yes — both report '16.0'. To tell them apart, look at the build number: Outlook 2019 starts at 16.0.10325.20082 and goes up. Anything below 16.0.10228.20096 is definitely 2016. No overlap.

Your Situation	Best Method	Why
Outlook opens normally	File > Account > About Outlook	Fastest, most reliable path. Shows full build and architecture.
Outlook crashes on startup	Registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Outlook\Setup\Version	No Outlook instance needed. Works even when the app won’t load.
You’re a delegate in a shared mailbox	Alt+H > About Outlook	Same version applies — delegates run the local Outlook binary, not the mailbox’s software.
IT blocked the Account page	Command Prompt: winver + outlook /version	outlook /version prints the exact build to console — no GUI required.
You need proof for vendor support	Press Ctrl+Shift+Alt+H, click Copy, paste into email	Includes timestamp, product ID, and bitness — all vendors ask for.