Purpose of mailmessagestore Attribute

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What is the purpose of the 'mailmessagestore' attribute in LDAP?

It specifies the name of the partition on which the user's folders should be placed. If the folders already exist in the folder DB, then it is not used.

Please note however that it is desirable for the mailmessagestore value to correspond with the actual partition that the user is using. In the case of a needing to run a full reconstruct -m, the software will rely on the mailmessagestore to locate the users account on disk.