It was an approximately 2 hour 30 outage by the looks of it during which they shut the whole airspace down, even VFR (quite a lot of VFR flights appear not to have gotten the NOTAM in time though). All arrivals to ZRH and GVA were diverted and outbounds held. Apparently Altenrhein (LSZR) was able to launch their Vienna flight across the border to Germany.
We don't know the extent of the outage yet only that they were not even able to produce the NOTAM themselves but had to enlist help from Austria. So the question is, if the radio systems (VHF) kept working or not.
If some sort of "basic service" such as uncontrolled approaches out of a holding outside the FIR for instance would have been possible for the longhauls is debatable but not really something done here.