These two files seem to be involved. If you click 'Delete Sign-In Info'
at the login screen this is the only file that seems to be
modified.~/Library/Containers/com.microsoft.SkypeForBusiness/Data/Library/Application
Support/Skype for Business/offlin...
We suddenly started experiencing this problem on our two Mac Mini
Servers (10.9.3 and 10.9.4) last week.Some time ago we also had the
Unicast ARP problem to our CISCO switches, which was resolved with
net.link.ether.inet.arp_unicast_lim: 5 -> 0 Using...