How you implement the archiving of PST files will depend on the number of files to be archived, your company policy on the use of PST files and whether users have infrequent access to a fast network connection.
There are several ways to import PST files into Enterprise Vault:
Wizard-assisted migration can be used for a small number of PST files.
Scripted migration using Enterprise Vault Policy Manager is ideal for performing bulk migrations of PST files.
Locate and Migrate uses Enterprise Vault Tasks to locate PST files on users' computers, copy them to a central location, and then import them. Locate and Migrate is designed to minimize the difficulties of collecting PST file from users' computers and is likely to require least effort on your part.
Client-driven Migration is similar to Locate and Migrate but the locating of PST files and sending them to a collection location is done automatically by the user's computer and not by Enterprise Vault Server Tasks. This can be useful if, for example, there are users with laptop computers who are in the office only one or two days a week, thus making it difficult to obtain their PST files by other methods. Client-driven migration needs to be enabled in the Administration Console.
To aid PST migration you can configure desktop clients so that, when a user starts Outlook, the client writes a marker into each PST file that is listed in the mail profile. When a marked PST file is subsequently imported, the marker indicates the owning mailbox.
PST migration is described in the Administrator's Guide.
When planning PST migration, take the following points into consideration:
Do not enable PST migration for all users at the same time. Migrate the PST files for a small group of users and then move onto the next group.
An administrator has to allow each PST file before it can be imported.
It is important that the language setting in the properties for each PST is correct before the PST is imported.