What's the difference between Skype TOM and Skype TM?

TOM Online is the name of the company that skype used to operate in China, so it is called skype.

Tom, but at present, skype's operating company in China is Guangming Fangzheng, and skype.

TM in TM is the abbreviation of trademark, and TM is usually added to American trademarks, indicating that the company has implemented trademark protection for skype, and there is no necessary connection between them.