We have setup exchange server 2013.We tried configuring some user mailboxes and room mailboxes.After 3-4 days of using,we encounter Microsoft.Exchange.Data.Storage.MailboxOfflineException in event viewer and after that whenver we try to send mail from user mailboxes ,it will stuck in drafts folder.Could you help us in resolving this issue.I have inserted the screenshot for reference.

Thanks and Regards,

Hari prasad Tammineni

• Moved by Jason Johnston [MSFT]Microsoft employee Tuesday, June 23, 2015 3:40 PM Not a development question.

Hi Hari,

Is there any update on this thread?

Except above suggestion, I also recommend you check the following

1. Check if all the exchange services are running fine.

2. Check if the time between DC and Exchange had been synced.

3. If you create a new database and create a new mailbox in it, is there the same issue?

4. http://khmercomputertrick.blogspot.com/2013/05/owa-2013-emails-stuck-in-drafts-folders.html

Best regards,