Is it possible to make text strikethrough while sending instant messaging in skype?
Now, it is currently possible in both Mac and Windows. Using ~ tildes surrounding text will make it strikethrough:
~this will strike-through~
source - mac v7 & windows preview
While you can't do it quickly, you could use an online website to generate the text. Then you could copy and paste it in.
For example: http://fsymbols.com/generators/strikethrough/
Some Skype clients support this: ~strike~ Its depending on the client though.