После удаления сервера Exchange 2007 не забудте про Offline Adress Book

Warning: Offline address book server has been deleted Open the Exchange Management Console. Expand Microsoft Exchange, expand Organization Configuration, and then select Mailbox. In the results pane, click the Offline Address Book tab. On the Offline Address Book tab, select "Default Offline Address Book". In the action pane, Click Move to start the Move Offline Address Book wizard. This wizard allows you to move OAB generation to a different server. It will also copy the existing OAB files to the specified server. Error: Offline address book is not associated with a particular mailbox store To associate the Offline Address Book with a particular mailbox store in Exchange 2007 In the Exchange Management Console, expand Server Configuration, and then click Mailbox In the Database Management window, right-click Properties on the mailbox store. Click the Client Settings tab, click Browse, and then click the appropriate offline address book. Click OK two times to finish.