MailBee.NET Objects v12.4 Released

Thursday, 14 December 2023

The latest release of MailBee.NET Objects now officially supports .NET 8.0 and OAuth 2.0 Client Credentials Flow for Microsoft 365 SMTP service.

SMTP was the last e-mail protocol for which Microsoft added full OAuth 2.0 support. Now you can fully supersede the discontinued login/password authentication with modern OAuth 2.0 for all e-mail protocols Microsoft (and MailBee.NET) supports - SMTP, IMAP, POP3, and EWS. MailBee.NET documentation and samples now reflect this change.

MailBee.NET Objects v12.4 also comes with the improved MIME message builder. This can be important in advanced cases when you modify and re-send existing e-mail messages with a complex structure. For instance, the new builder will honor the existing hierarchy of nested parts rather than building it from scratch.

Outlook Converter component can now extract more info from PST and MSG files.


This update is compatible with the existing v12 keys. Still, you need to have a valid maintenance contract in order to upgrade. In case if your maintenance contract has already expired, you'll need to renew it first. This can be done at (or just drop us a message if your key is not recognized).

Having questions? Please feel free to contact us at

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