If you can' type in Word, then you must activate Office or remove the document protection to remove the Selection is locked message.

A lot of people use apps like Microsoft Word to create documents with interactive checkboxes. For instance, you'd need to insert checkboxes if you're putting together a to-do list (and don't want ...

Basically, Microsoft wants to ensure that you can use the current version of Microsoft to open documents from twenty or even thirty years ago, complete with all features—including WordArt.