Image Credit: Flickr Creative Commons
Required Programs: Microsoft Word (recommended), Calibre (recommended), Sigil (optional)
1. Open the document you want to convert into an e-book.1
2. If the text in your document has been encoded in a code page other than Unicode, copying and pasting the text into a new MS Word document and saving it will automatically re-encode the text as Unicode (source). Skip this step if your document is already in Unicode.
Steps: Select all the text (CTRL+A), copy (CTRL+C) and Paste as HTML Format. The reason I wouldn’t recommend Paste Special > Unformatted Unicode Text or Unformatted Text is because it can create really messy html code.2