Sending from alternative addresses in Exchange

One of the most frequent requests I get from users with Exchange, is to be able to send from one of their alternative email addresses, that is one of the addreses there account is configured with in Exchange, but that is not their primary address. Unfortuantely as far as I am aware Microsoft have not yet come up with a solution to this.

I've used a number of hacks to get round this, sepearate accounts with POP3 access, Using the from field in outlook, but each have there draw back. What have you used in these situations to allow the use of these alternative addresses?

The are only two ways I'm aware of:

One, is to use multiple accounts and have the users change the from field (which makes it basically useless and a maintenance nightmare).

Two, there is a program called Choose From that promises to do it, unfortunately it is quite pricey ($239 for 1-2 users).

Not ideal, but you could add a POP3 account to the user's profile in Outlook, with the secondary email address. Then misconfigure the incoming mail server and remove the POP3 account from the Send/Receive group.

Now when a new email is created, the "Accounts" button appears on the toolbar to choose which account to send from.

Edit: Re-reading your question, it appears you may already be doing this, but mentioned there are drawbacks...anything specific?