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Mavericks 10.9.1 problem sending mail through Exchange Sever

Ulrich Wesche reports that updating Mavericks with the OS X 10.9.1 version did not solve problems with duplicate mail with the Mail app and Exchange Server. He also reports that the update unfortunately introduced a new problem with Exchange:

Here's what happened after the installation of the 10.9.1 update:

Drafts are still emerging; when writing a mail in the Mail.app, connected with an Exchange server (2007), drafts are saved multiple times -- for example, 13 drafts of the same mail. Usually they are supposed to vanish when the mail is sent, but they don't.

New with 10.9.1: Mail.app seems to lose connection to the Exchange server and can't send mails. It keeps coming up with the notice: "mail can't be sent by server."

Any preferences were changed before or after the update. This connection issue resembles the big problems in iOS 7.

If you've seen these problems