Maximum amount of items in an edb database

I try to find out if there´s a limitation concerning the maximum amount of items (messages,appointments ...) in an edb database.
I´m currently on Exchange Enterprise 2010 SP3 with 3 databases in a DAG. One of this databases contains more than 5000000 items.
Does anyone know when its going to be critical?
Thanks for your help.

Thank you for your reply. This website seems to have its scope on limitations to user mailboxes but it led me to this Technet article and this was helpful.
http://technet.microsoft.com/en-us/library/cc535025.aspx
"When you consider the appropriate maximum item count for your organization, understand that there is no cliff at the maximum value, but instead a progressive degradation in performance. The stated limits are not hard-coded. They are numbers based
on testing and code analysis. As the item count increases, performance may degrade to a user perceivable level. The level of performance that is acceptable for users in your environment will dictate the appropriate maximum item count for the environment."
I think that is what I´ve been searching for. In fact there´s no limitation for objects in a database. There are limits for objects in critical folders that must be considered to keep up performance for Exchange.
Cheers

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