What to use for login ID?

Question

We are in the early design stages of a major rewrite of our product. Right now our customers are mostly businesses. We manage accounts. User names for an account are each on the

Answer 1

Right now our customers are mostly businesses.

People seem to be missing that line. If it's for a business, requiring them to login via OpenID really isn't very practical. They'd either have to use an external OpenID provider, or their poor tech people would have to setup and configure a company OpenID.

If this were "should StackOverflow require OpenID for login" or "Should my blog-comment-system allow you to identify yourself via OpenID", my answer would be "absolutely!", but in this case, I don't think OpenID would be a good fit.