Technically, the company went bankrupt and was split and sold to GENBAND and Avaya - Interestingly, Mark Straton who used to head up Siemens Enterprise Communications was on a panel last week at ITEXPO and mentioned his company drove up the price of Nortel during the bankruptcy process - this in part led to the recent Avaya bankruptcy.
Other surprises - Ovum is a research firm but hit the top ten... So did RingCentral - coming in just under iPhone!
The Acision brand no longer exists. It became Comverse then Xura and soon will become Mavenir Systems.
Quintum is another surprise - the company made VoIP gateways back in the day but the brand hasn't been used for many years.
MIT made the list as the only university - interesting but not really as TMCnet is a tech site.
Notable items missing were IBM, Google and Microsoft - for whatever reason.
Anyone else you think should have made the list but seems mysteriously absent? Be sure to let us know in the comments... Thanks!