Is there a way that we can use strikeouts/strikethroughs in the messages, writeboards, etc..?

HTML: <s>struck-out text</s>

Thank you very much! <s>Woohoo!</s>

Pre and post fixing the applicable text with hyphens will yield strike out text.

For example:

I'm -sure- not sure.

Will produce:

I’m sure not sure.

All lucidly detailed in the textile help file.

When comparing versions you will automatically get strikeouts.

So if you are looking to compare versions, just do your editing and compare any two versions.

You won’t have to waste your time manually putting strikeouts in.