SBS 2008 – Exchange and Quotas

SBS 2008 includes the default message store limits for Exchange 2007 – 2GB per mailbox. But it imposes this limit in two places that you will need to know during a migration.

1. The Exchange Message Store has a 2GB limit at installation time.
2. The Standard User Role has a user quota for Exchange of 2GB.

If you are migrating a system that has users with mailboxes over 2GB, you need to address both of these items. Adjusting the quota for the message store is fairly straightforward, and you actually won’t be able to complete the Move Mailbox portion of the migration until you adjust this setting if you have mailboxes with more than 2GB of data in them. But that’s the time you should also go in and either adjust the Standard User role to remove the 2GB quota, or create a new role based on the Standard User role that does not have the quota enabled.

Unless you want to force the user to shrink their mailbox size to under 2GB.