They occasionally take the servers down for upgrades, tests, maintenance, etc.
Don't forget that these servers handle really big loads and operate 24/7 for very long periods without being switched off, which is way more than any normal PC is expected to endure. So it's to be expected that they occasionally need to go down to cool off or undergo repairs.
MSN messenger does have more downtime than other instant messenger services, but also it has many more users and features than other clients. I think to be honest I can put up with the occasional downtime if it means that I get to use a completely free and ultimately superior messenger client that all my friends use.
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