thunderbird 154

Thunderbird 154 is a stable release of the Mozilla email client that enables Microsoft Graph for Microsoft 365 accounts, marking an important compatibility step for Windows users and Microsoft 365 administrators. The update also introduces an optional system tray behavior that keeps the client running after its final window closes, along with fixes affecting IMAP, Exchange, calendaring, contacts, and crash handling. While the Graph enablement is the headline feature, it does not represent full Microsoft 365 feature parity. This tag covers discussions about Thunderbird 154's release notes, beta documentation, and the practical implications for users and IT administrators managing email clients in Windows environments.