This is an interesting one I found. We set Message Tracking on out Hub Role servers so it would purge the logs after 30 days .. nice and simple.
So, I need to look for some logs over Easter and they where no there!?! As you can see Message Tracking has another setting MessageTrackingLogMaxDirectorySize and my logs amounted to 240mb which is why I couldn't find them.
So, make sure you have set MessageTrackingLogMaxDirectorySize to a decent size, like 2gb? You can do this by running:
Also make sure these setting are the same on any Mailbox role, as they have Message Tracking logs too!
But to set it on a Mailbox Role you need to run:
Set-MailboxServer <Hub Role Server> -MessageTrackingLogMaxDirectorySize 2gb
An easy way to remove (some) entries from the autocompletion list in OWA 2007 Exchange Server Public