WP OAuth Server (OAuth Authentication) vs WPO365 | Mail Integration for Office… (2026)
Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.
WP OAuth Server (OAuth Authentication)
3.0K+ active installs
Free
WPO365 | Mail Integration for Office…
2.0K+ active installs
Free
Quick Verdict
As of April 2026, WPO365 | Mail Integration for Office… has a higher user rating (4.9/5 from 26 reviews) while WP OAuth Server (OAuth Authentication) leads in active installations (3.0K+ vs 2.0K+). Both are free WordPress plugins. WP OAuth Server (OAuth Authentication) has accumulated 174K+ total downloads while WPO365 | Mail Integration for Office… has 59K+.
Detailed Comparison
| Metric | WP OAuth Server (OAuth Authentication) | WPO365 | Mail Integration for Office… | |
|---|---|---|---|
| Rating | 3.8/5 | ► | 4.9/5 |
| Total Reviews | 41 | ◄ | 26 |
| Active Installs | 3.0K+ | ◄ | 2.0K+ |
| Total Downloads | 174K+ | ◄ | 59K+ |
| Support Resolution | N/A | N/A | |
| Last Updated | 2 months ago | ◄ | 1 year ago |
| First Released | 2013 | 2020 | |
| Age | 13 years | 6 years | |
| WP Requires | 4.7.2+ | 5.5.3+ | |
| PHP Requires | 7.4+ | 7.1.1+ | |
| Business Model | Free | Free | |
| Latest Version | 4.5.0 | 1.9.2 |
Rating Breakdown
WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…
Download Trends
Over the past 30 days, WP OAuth Server (OAuth Authentication) averaged approximately 42 daily downloads while WPO365 | Mail Integration for Office… averaged 8.
Recent Reviews
WP OAuth Server (OAuth Authentication) Reviews
Serious security flaw — tokens remain valid after logout
I tested WP OAuth Server (OAuth Authentication) in integration with a client application and found a serious issue: even after the user logs out from WordPress, the issued access token is still accept
Abandoned plugin
It looks like the plugin is abandoned. Moreover, I bought a Pro version but it doesn’t work and nobody replies via the support email. I can’t even access my license key because the password restore do
This plugin is really fantastic
I just want to say thank you to the developer, you have done a great job and saved me a tonne of time 🙂
WPO365 | Mail Integration for Office… Reviews
Awesome
Works like a charm and has a great tutorial on how to set it up. Thank you!
Super good mail plugin
I really appreciate author’s contribution. I installed this plugin and it has been working great! Now I have upgraded my WordPress to version 6.0. This plugin is still working as usual. Can’t imagine
It works and is not difficult to configure
Very nice plugin. Highly recommended. Create the app on O365. Take record of the client ID, secret, Tenant ID. Put them all into the plugin. Authorize. Then everything works fine. The plugin does not
More Oauth Worth Comparing
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Authorizer limits login attempts, restricts access to specific users, and authenticates against external sources (OAuth2, Google, LDAP, or CAS).
Frequently Asked Questions
Is WP OAuth Server (OAuth Authentication) or WPO365 | Mail Integration for Office… more popular?
Which has better ratings — WP OAuth Server (OAuth Authentication) or WPO365 | Mail Integration for Office…?
Are WP OAuth Server (OAuth Authentication) and WPO365 | Mail Integration for Office… free?
Which plugin has better support — WP OAuth Server (OAuth Authentication) or WPO365 | Mail Integration for Office…?
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Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.