Published at LXer:
Exchange wasn't successful enough as a straight SMTP mail server... at least not for Microsoft's taste. The field is simply too crowded with excellent competitors, both Linux and Windows. So Redmond added more features and set its cap for the Lotus Domino-dominated groupware segment. There, Exchange has enjoyed steady gains, despite Domino's powerful clustering and cross-platform abilities. This has left a lot of users wondering if IBM has the stomach for the fight.