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By default, when a user starts Outlook, the client writes a marker into each PST file that is listed in the mail profile. The marker indicates the Enterprise Vault site, the default archive, and the default retention category. All the PST migration tools can use the marker to determine the owning mailbox and then migrate the file contents to that mailbox's default archive. Marking PST files can be configured off or on in Exchange Desktop policies using the setting, , in the list of advanced Outlook settings.
If marking is switched on, then the Enterprise Vault client does the following when Outlook starts:
Tries to open every PST that is listed in the user's mail profile. The next time users start Outlook they will be prompted for passwords to password-protected PSTs and will receive error messages for any PSTs that are inaccessible.
Does not update the PST file marker again except when a different mail profile is used that lists that PST file. This means that Policy Manager assumes that the PST is owned by the last profile that was used to access the file.
Marks any further PST files that are subsequently added to the mail profile. The marking happens when Outlook is started, so merely opening a PST file and then closing it again is not sufficient to mark that PST.