Exchange Information store is the most critical constituent of Microsoft Exchange Server. Sometimes, when the Exchange Server is hit by any crashing or corruption issue, information store also gets affected. In order to access your mailbox, you need to mount the Information store. However, under some corruption or any damage situation, the mailbox store or public store denies to mount. In this case you will not be able to access your information such as emails, notes, contacts, images, attachments and more, stored in Exchange Mailbox. These Exchange mailboxes are connected to Information store database that keeps all data of active directory. The Mbconn.exe file is used to connect these mailboxes to Active Directory accounts.