Early November 2022, ownership of the Mail Integration for Office 365 / Outlook plugin transferred to WPO365. We are committed to provide (best-effort based) support for this plugin until the end of 2023.
To ensure, however, that we are able to provide you with long time support, we urge you to download and install the WPO365 | MICROSOFT GRAPH MAILER plugin for WordPress instead (and de-activate the Mail Integration for Office 365 / Outlook plugin and remove it from your WordPress website).
If you have already installed and configured the Mail Integration for Office 365 / Outlook plugin, then please make sure to check out our easy-to-understand online migration guide.