How does the EDB handle deleted items and why am I only able to recover some and not all previously deleted emails?

Hello,
I have been unable to locate information regarding how the EDB handles deleted files. I am able to recover deleted emails from the EDB; however, there are numerous emails that I know have been deleted, that were not recovered during the recovery process.
Is this because the EDB dumps deleted emails once it reaches a certain amount of entries? Or is it more likely the deleted items are corrupted and thus not recoverable? Thank you for your time and I look forward to your responses. The
product in question is Microsoft Exchange Server 2007.

Great information from the other posters and one other possible explanation is if the users did a HARD DELETE. More information on this below
Pre-Exchange 2010 Dumpster 1.0 worked as follows;
1. When a user does a normal delete of an item via Outlook or OWA it gets sent to your deleted items folder
2. If the user then empties deleted items folder those items are then marked with the ptagDeletedOnFlag attribute which in essence hides them from the view of the user
3. At this point the user can use the Recover Deleted Items function in Outlook to recover those items as long as the items were NOT purged using the Recover Deleted Items option OR the items have not passed still the deleted item retention period.
NOTE: Every day there is a nightly maintenance process that in short looks through the DB and examines items that have been deleted. Items that have met or exceeded the deleted item retention period are purged from the system and are
completely non-recoverable. More about this at the end of my post.
4. However if the end user were to delete an item from the Inbox or another folder in Outlook by using Shift + Delete aka a Hard Deletion the item is left in its orignal location and gets marked with the ptagDeletedOnFlag attribute which again just
hides it from view.
5. By default you can only use the Recover Deleted Items option on the Delted Items folder. Howeve you can make it so that you can recover hard Deleted items from other folders. More on that here http://support.microsoft.com/kb/246153
5. The problem with this method though IMO is that you have to know where to look and that can be rather time consuming.
6. If you want a more elegant method to resolve this and are open to using 3rd party utilities check out Lucid8's DigiScope.
http://www.lucid8.com/product/digiscope.asp which will allow you to open any offline copy of the DB from a forensic point of view and to solve your specific issue you can either turn on a filter to ONLY
show hard deleted items OR you can search the entire store and all mailboxes for just deleted items and can then view or export them to PST or MSG format. You can download the product and obtain a 30 day demo license which will allow you to find any
hard deleted items, however to view them or export your would need to purchase a license.
NOTE: When a database is backed up or copied it is an "Offline" database and then its offline the data retention period is not an issue because the nightly online maintenance process can only act on a database that is mounted on an
Exchange server. So for this reason if you want to recover the most data possible use offline copies/backups of the DB with a 3rd party utility like DigiScope
NOTE 2: Exchange 2010 and 2013 use Dumpster 2.0 which is an entirely different beast and I will not go into that in this post since its nearly 1AM however DigiScope can expose that information as well
Search, Recover, & Extract Mailboxes, Folders, & Email Items from Offline Exchange Mailbox and Public Folder EDB's and Live Exchange Servers or Import/Migrate direct from Offline EDB to Any Production Exchange Server, even cross version i.e. 2003
--> 2007 --> 2010 --> 2013 with Lucid8's
DigiScope

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