App
To download the Microsoft Lync Web App plugin offline installer, head straight to Microsoft’s official archive—this version works on legacy systems where modern browsers fail.
Stuck with outdated browsers or IT policies blocking updates? The offline installer restores full Lync features—video calls, file sharing, and even desktop sharing—without touching your browser settings. Below, I’ll walk you through the direct download link, system checks, and a few tricks to bypass common installation roadblocks.
Where to download the Microsoft Lync Web App plugin offline installer (2023 update)
Microsoft's Lync Web App Plugin bridges the gap between outdated browsers and full communication features. If you're stuck on Windows 7/10 with Internet Explorer 11 or older, this plugin restores video calls, file sharing, and desktop sharing capabilities that modern browsers can't replicate.
The offline installer is your best bet for legacy systems where browser updates aren't an option.
Unlike cloud-based solutions, the offline installer runs locally, eliminating dependency on HTML5 or WebRTC support. This means no more choppy video calls or missing features when using Firefox 52 ESR or Chrome 65 on older machines.
Below, I’ll guide you through the official download process, including system requirements, direct links, and verification steps to avoid fake download sites.
⚠️ Critical Note: Microsoft no longer actively updates Lync, but the plugin remains functional for legacy environments. Always download from Microsoft's official servers to avoid malware risks.
Ensure your system meets these minimum requirements:
- OS: Windows 7 SP1 / Windows 10 (32/64-bit)
- Browser: Internet Explorer 11 (required)
- CPU: 1.6 GHz or faster
- RAM: 2 GB minimum (4 GB recommended)
Open Internet Explorer 11 and visit:
https://www.microsoft.com/en-us/download/details.aspx?id=38372
✅ Tip: Bookmark this link for future use.
On the download page, locate the Lync Web App Plugin section and click the Download button next to the Offline Installer (typically labeled as LyncWebAppPlugin.x86.msi or LyncWebAppPlugin.x64.msi).
⚠️ Warning: Avoid third-party sites like Softonic or CNET—they often bundle adware.
After downloading, check the file properties:
- File Size: ~5-10 MB (varies by version)
- File Name: LyncWebAppPlugin.msi (where is x86 or x64)
- Digital Signature: Signed by "Microsoft Corporation"
Right-click the file → Properties → Digital Signatures tab to verify.
Double-click the .msi file and follow the prompts. Ensure you:
- Select "Install for all users" if managing a workstation.
- Restart your browser after installation.
Once installed, the plugin will appear as an option in your Lync Web App or Microsoft Teams login page. Look for a prompt like "Install the Lync Web App Plugin"—this confirms the installer worked.
For Windows 10 users, you may need to temporarily disable SmartScreen in IE11 settings if the installer is blocked.
Pro Tip: If you encounter error code 0x80070643, it’s likely a permission issue. Right-click the installer → Run as Administrator and retry. For corporate environments, IT admins may need to whitelist the plugin via Group Policy.
For users on Windows 7, ensure Service Pack 1 (SP1) is installed, as older versions lack critical dependencies. If you’re still facing issues, Microsoft’s support forum for Lync (now Teams) can help troubleshoot specific errors. Always cross-reference with Microsoft’s official documentation for the latest updates.
Remember: This plugin is designed for legacy systems. If possible, consider migrating to Microsoft Teams for long-term support, as Lync is now deprecated. However, for now, the offline installer remains a lifeline for organizations stuck on older hardware.
How to Install and configure the Lync Web App plugin for full features
Once you’ve downloaded the Lync Web App Plugin, installation is straightforward—but legacy systems often throw curveballs. This guide walks you through the process, from pre-install checks to enabling video calls, screen sharing, and Outlook integration.
I’ll also cover the most common pitfalls, like missing dependencies or admin permission errors, that trip up even experienced users.
Before diving in, ensure your system meets the minimum requirements: Windows 7/10 (32-bit or 64-bit), Internet Explorer 11 (or later), and at least 2GB RAM. If you’re on a corporate network, check with your IT team—some environments block plugin installations for security reasons.
Pro tip: Run the installer as an administrator to avoid permission roadblocks.
Only download the plugin from Microsoft’s official site or trusted sources like your organization’s internal portal. Third-party sites often bundle malware with the installer. Always verify the file hash (SHA-256) against Microsoft’s published checksums to ensure authenticity.
Start by double-clicking the downloaded LyncWebAppPlugin.exe file. The installer will guide you through the process, but pay attention to the custom installation options. Uncheck any optional toolbars or browser extensions unless your IT policy explicitly requires them.
For legacy systems, I recommend selecting the "Basic" installation type to avoid conflicts with existing software.
After installation, restart your browser—this step is critical for the plugin to register properly. Once back online, navigate to your Lync Web App or Microsoft Teams meeting link. You should now see the "Install Plugin" prompt in the top-right corner.
Click it, then log in with your credentials. If you don’t see this prompt, clear your browser cache or try a different browser like Firefox or Chrome.
To enable video calls and screen sharing, open the plugin settings (click the gear icon in the top-right corner). Under "Device Settings", select your webcam and microphone. For Outlook integration, ensure the plugin is enabled in your Outlook add-ins menu (File > Options > Add-ins).
If you’re still missing features, check your firewall settings—some corporate firewalls block plugin communications.
Verify everything works by joining a test meeting. Initiate a video call, share your screen, or send a file to confirm the plugin is fully operational. If issues persist, revisit the installation logs (located in C:\Program Files\Microsoft Office\Lync Web App Plugin\Logs) for error codes.
For stubborn problems, Microsoft’s Lync Web App support page is your best resource—bookmark it now for quick troubleshooting.