Files are in Comma Separated Value(CSV) format. This is widely supported and any spreadsheet should be able to export in this format.
The supported fields are:
The user's name, e.g. "Alice" or "John Smith".
The user's email address. A check will be made to see if a user with this email address already exists. Capitalised addresses are converted to lowercase.
A message to with the invite.
A "suggested" username. If not supplied a suggested username is auto generated.
name, suggested username, email, invite message Paul, paul, paul@test.com , Hi Paul John, , john@test.com Alice , alice, alice@test.com