Exchange Mountability Checks fail with JET 1018 and 1022 errors. These errors are usually the result of a lack of resources. For more information, click here. The following steps may help to detect possible reasons that may cause the issue.
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Application Logs: There may be ESE errors that state “The read operation will fail with error -1022 (0xfffffc02)”. If Exchange asks the operating system for a page in the database and an error occurs instead of the page data being returned, a -1022 error (JET_errDiskIO) results. The -1022 error is a generic error that appears whenever a disk input/output (I/O) problem prevents Exchange from gaining access to a requested page in the database.
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System logs: There may be NTFS errors that state “Ntfs 55; the file system structure on disk is corrupt and unusable. Please run the CHKDSK /R utility on the volume “Drive_letter”.” The NTFS error is generated as a result of the ESE 1022 error, as Windows believes there is an issue with the disk because it was unable to fulfill a request by an application.
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Mountability Error example: Mail store 'D:\Program Files\Microsoft\Exchange Server\V14\Mailbox\Mailbox Database 2012043020\Mailbox Database 2012043020.edb' is not mountable. Error: 'Error opening database. Jet returned error code -1018, Error closing database, Error opening database. Jet returned error code -1018, Database cannot be mounted'
