As I recently had experience with, Microsoft changed the name of terminal-services (Windows Server 2003) to remote-desktop-services (Windows Server 2008). At time of writing, these tags have 111 and 47 questions respectively; the much broader remote-desktop tag has 519 questions (with overlap to the other two tags) but there are potentially only a small number which cover the exact same area (RDP access to a multi-user Windows server); speaking of which, rdp has 271 questions.

For any Windows Server experts (or otherwise): should these tags be unified (via synonyms?), or are they distinctly different subject areas which require distinct tags?