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Single Import Operations Only from Each Exchange Mailbox

We strongly recommend that you only run one import operation at a time from a single Exchange mailbox. This is to avoid the risk of generating duplicate imported events on the CMS. For example, if two Event Import operations (running on separate machines) are simultaneously importing emails from the ‘Frank Schaeffer’ mailbox, there is a risk that individual emails sent to or from Frank Schaeffer are imported twice, generating duplicate events on the CMS. There is also a lesser risk that some emails are not imported at all.

Note: You can, however, run multiple import operations simultaneously from separate Exchange mailboxes. Note also the MAPI and CDO requirement for mail box import operations

More information:

Importing from Exchange Requires MAPI Client and CDO 1.2.1 Component