Setup guide

Architecture 19
The exact number of users you can support depends on your server hardware and operating
system. For more information, see “Server Requirements” on page 21.
PST User Cache Files
The BlackBerry Enterprise Server uses MAPI to extract mailbox information, usually expecting
information from a Microsoft Exchange store. Because of this, the BlackBerry Enterprise
Server relies on MAPI-specific properties for messages, folders and other objects.
Due to this architecture, the Google Apps Connector also uses MAPI, and synchronizes
Google Apps user content to a local user cache within a PST file.
When a new user is added, the Google Apps Connector builds an initial cache of the past
1000 messages in the Inbox when a new user is added, as well as all contacts and calendar
events, and adds it to the PST file. The Google Apps Connector will prune the user email PST
cache so that only the past 30 days of email is stored in the cache. Because of this caching
model, expect to use about 500MB of disk space for each PST file.
Keeping a local cache of the data makes the availability of the server transparent to the
BlackBerry Enterprise Server. Synchronization tasks run in the background, and if the Google
Apps Connector server in your environment fails, the messages will be stored safely and will
be synchronized properly once the system is back online.