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)

WP OAuth Server (OAuth Authentication)

3.8(41)

3.0K+ active installs

Free

Updated 2 months ago
View WP OAuth Server (OAuth Authentication)
VS
WPO365 | Mail Integration for Office…

WPO365 | Mail Integration for Office…

4.9(26)

2.0K+ active installs

Free

Updated 1 year ago
View WPO365 | Mail Integration for Office…

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

Rating
3.8/5WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…4.9/5
Total Reviews
41WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…26
Active Installs
3.0K+WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…2.0K+
Total Downloads
174K+WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…59K+
Support Resolution
N/AWP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…N/A
Last Updated
2 months agoWP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…1 year ago
First Released
2013WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…2020
Age
13 yearsWP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…6 years
WP Requires
4.7.2+WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…5.5.3+
PHP Requires
7.4+WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…7.1.1+
Business Model
FreeWP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…Free
Latest Version
4.5.0WP OAuth Server (OAuth Authentication)
WPO365 | Mail Integration for Office…1.9.2

Rating Breakdown

WP OAuth Server (OAuth Authentication)

3.8/5(41 reviews)
5
61%
4
7%
3
5%
2
2%
1
24%

WPO365 | Mail Integration for Office…

4.9/5(26 reviews)
5
96%
4
0%
3
4%
2
0%
1
0%

Recent Reviews

WP OAuth Server (OAuth Authentication) Reviews

by Jonathan Afranio

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

by Vic

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

by Northern Beaches Websites

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

by yousefmansour

Awesome

Works like a charm and has a great tutorial on how to set it up. Thank you!

by yf1019

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

by gotaiwai

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

Frequently Asked Questions

Is WP OAuth Server (OAuth Authentication) or WPO365 | Mail Integration for Office… more popular?
WP OAuth Server (OAuth Authentication) has 3.0K+ active installations while WPO365 | Mail Integration for Office… has 2.0K+. WP OAuth Server (OAuth Authentication) is the more widely-used plugin as of April 2026.
Which has better ratings — WP OAuth Server (OAuth Authentication) or WPO365 | Mail Integration for Office…?
WP OAuth Server (OAuth Authentication) has a 3.8/5 rating from 41 reviews, while WPO365 | Mail Integration for Office… has a 4.9/5 rating from 26 reviews.
Are WP OAuth Server (OAuth Authentication) and WPO365 | Mail Integration for Office… free?
WP OAuth Server (OAuth Authentication) is free and WPO365 | Mail Integration for Office… is free. Both can be downloaded from the WordPress.org plugin directory.
Which plugin has better support — WP OAuth Server (OAuth Authentication) or WPO365 | Mail Integration for Office…?
Support resolution data is not available for all plugins. Check each plugin's WordPress.org support forum for current response quality.
Which plugin is updated more frequently?
WP OAuth Server (OAuth Authentication) was last updated 2 months ago and WPO365 | Mail Integration for Office… was last updated 1 year ago.

Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.