You are confusing a new server (the "realm" or whatever named copy of EQ you play, i.e. Tunare, Quarm, etc), and a computer server, that is, a literal CPU (or, these days, several connected CPUs, each of which has multiple cores) along with it's associated memory and other support electronics.
The extended maintenance on the "servers" could be anything. Could be updating the computers, the network which supports them all, or even the supporting s/w that controls all of this. And these days, most of the individual servers (the individual PCs) are instanced, as needed, from a pool, and could very well be virtualized (another level of abstraction).
Tat
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Tatanka Wolfdancer, 115 Wood Elf Druid, 9 x 300+ Master Artisan, 7 maxed trophies (dang research! :)
Michone, 115 Troll Shadowknight
Anaceup Mysleeves, 115 Erudite Mage, 2 x 300 Master Artisan
Snookims Whinslow, 112 Erudite Enchanter, 2 x 300 Master Artisan
<Inisfree>, Tunare (Seventh Hammer!)