Windows 10 will power to its third anniversary this summer, but one branch, identified by the initials L-T-S-B, remains an enigma to most corporate users.

LTSB, which stands for "Long-term Servicing Branch," was among the pillars of Windows 10 in the months leading up to, and for months after, the mid-2015 roll-out of the operating system. For a time, it seemed that it had a shot at becoming the Windows 10 for enterprise because it was seen as a calm port in a storm of radical change.

That hasn't happened, in part because Microsoft has steered customers away from LTSB.

Just what is LTSB? And what has Microsoft done to make it an afterthought?

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