Exchange store databases are dismounted when transaction logs are used uphttp://blogs.technet.com/asiasupp/archive/2007/05/29/exchange-store-databases-are-dismounted-when-transaction-logs-are-used-up.aspxRecently we have been seeing a number of issues with Exchange Server using all the transaction logs that are available to a storage group . This results in Exchange store databases dismounting without warning. Exchange uses transaction log files thaten-USCommunityServer 2.1 SP1 (Build: 61025.2)