Home > Exchange, Microsoft > Exchange 2010 Mailbox Database low disk space

Exchange 2010 Mailbox Database low disk space

This afternoon a customer contacted me, they were not receiving inbound emails but Outlook and outbound emails were working. I happened to be across the road so I went over to have a look. The Mailbox Databases were still mounted, the Hub Transport Server queues had errors and the inbound emails were waiting delivery.
It seems that once disk space for logs and/or databases gets below 1Gb Exchange cuts off all transport delivery to that database using logs on that volmues, this is to try to prevent running out of space.

In previous versions of Exchange administrators could tell when Exchange ran out of space as the Database would go offline and the logs or database drive would be full. Now with Exchange 2010 if you stop receiving email and the free space is below 1GB, Exchange willl have stopped transport delivery, this allows users to continue to access their mailbox and send outbound email by leaving the Databases mounted.

Once the free space is increased to over 1.5GB email transport will resume.


Categories: Exchange, Microsoft
  1. Anthony
    May 26, 2012 at 2:01 am

    What is the purpose of this article if there’s no solution to the problem described?!? Seems like you post junk articles to increase traffic to your site

    • June 12, 2012 at 5:21 pm

      Hi Anthony,

      Thanks for your comments. The resolution ot the problem is to increase the free space to over 1.5GB on the volume by purging logs, recoverable items etc. These steps are discussed in the MS Technet link I provided in the post and I did not see the need in including them in the post directly.


  2. Wassim
    August 21, 2012 at 4:07 am

    Actually the link you provided does not give clear guidelines on how to delete log files for example, as with most Microsoft links… it would have been better to provide some quick guideline on how to do it. I am not stuck at a client’s Exchange 2010 server, they ran out of space, while trying to move the mailboxes the database reached the same size as the partition and now we cannot even mount it anymore. Deleting the logs would be the best solution, and currently I am trying to find out the safest way…

  3. November 28, 2012 at 10:22 pm

    The purpose of this post was not to provide details on how to delete exchange database logs but to provide some background on new functionality and its impact on exchange.

  4. Josh
    December 5, 2012 at 1:27 am

    The log files should be cleared when you run a backup. If you need to, run a windows backup and that should clear up some space. It has worked for me in the past when I have had this issue.

  5. Kings
    September 6, 2013 at 9:19 am

    So much hate…..The article is posted on a VM blog and clearly states that that if you increase the storage, mail will flow. Cheers for the article

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