Database Size Limit on Exchange 2007

In Exchange 5.5, Exchange 2000, and Exchange 2003 up until sp1 the standard edition had a database size limit of 16 GB. With the release of Exchange 2003 Sp2, Microsoft increased the database size limit to 75GB! The database size limit for the enterprise edition has always been unlimited (or limited by hardware...)

Here's the table taken from the Microsoft Site detailing the differences between Standard and Enterprise Edition for Exchange 2007:

According to this table, the database size limit is unlimited for the standard edition. It was a great surprise for me to notice the following event log entry after installing a 64bit standard version of Exchange 2007:

What's going on?
The Exchange Server 2007 Standard Edition has apparantly a hard coded licensing database size limit of 50 GB, and for Service Pack 1 this is set to 250 GB...

Can this be changed?
Yes :-) the database size limit of 50 GB can be increased by creating the Database Size Limit in Gb registry value.

How do you do this?
The following two pictures show you the entry you have to do in the registry to change this, and the third one shows you the result after dismounting and mounting the store again.

What's the source for this registry key?
http://technet.microsoft.com/en-us/library/aa997432.aspx



Whats new in SP1?
In Exchange 2007 Sp1 (beta at least) the default limit has been increased to 150GB.