SBS2003 mailbox dismounts automatically

Exchange security
Microsoft Exchange
We have SBS 2003 with exchage2003 configured. Since last few days I am facing a problem, mailbox is automatically dismounts after 24-48 Hours. I think this problem is related to mailbox size limitation. How can we check the mailbox size limit in exchange 2003? & How can we increase the size of mailbox? After automatic dismounting if I remount it, then it mounts successfully without any error. If this problem is not related to mailbox size, please let me know the problem & how can I resolve this problem? Looking forward for your co-operation. Thanking You in Advace. With Best Reagrds, Dinesh K. Sanas

Answer Wiki

Thanks. We'll let you know when a new response is added.

I dont think that the problem is in the operating system /with the Exchange Mail box.The system may be infected / attacked with unknown virus.

You have not mentioned about the firewall infrastructure.If installed, what is the firewall make? (Software / Hardware)

Update your server with online Microsoft updates & check with different Antivirus Softwares.

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  • PhilipS68
    Check to make sure you have room on the logs drive. If you are running out of room due to logs, then the stores will dismount automatically. When the backup is run, the logs should purge themselves, hence the database mounts due to there being space.
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  • DineshSanas
    Hi, I am still facing a mailbox dismounting problem. It will dismounts a total mailbox under Administrative Group in Exchange Manager. Can anyone let me know where can I check the log for Exchange Server. It will definately help me to find out the root of the problem. Looking forward for your co-operation. Dinesh K. Sanas
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  • Brainstorm22
    Here are a few resources from that may help you with transaction logs: How to manually (and safely) purge Exchange Server transaction logs,289483,sid43_gci1187056,00.html Backing up, truncating and cleaning up the transaction logs,289142,sid43_gci1020743,00.html Structuring Exchange Server for the best log file protection,289483,sid43_gci1150301,00.html Clearing the confusion around Exchange Server circular logging,289483,sid43_gci1171496,00.html Partition the Information Store,289142,sid43_gci969509,00.html Regards, Kimbers Sheppard Assistant Editor
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  • Jspainhour
    The mailbox store limit in Exchange 2003 standard edition was 16 GB. They bumped this up to 75 GB with the recent release of Service Pack 2 for Exchange 2003. If your store is too big, you can see this problem where the store will mount for awhile then dismount. You can see where the logs are stored in system manager by going to Properties on the "First Storage Group." The transaction log is listed there and is typically, %DriveLetter%Program FilesExchsrvrmdbdata. The store location is found by going to Properties on the store that is dismounting, then clicking on the Database tab. If either hard drive is out of space (assuming the logs and store are on separate drives - a recommended practice) you can have this problem. If you are doing a backup, the logs are supposed to remove themselves, if not, you have to delete them periodically.
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  • Brijesh
    14,450 pointsBadges:

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