Will appreciate your help with the following task. The company where I work (company A) has acquired a company (company B) that has all its mailboxes hosted in O365. At the time of acquisition, the users of company B were issued a company A mailbox. As a result, currently those users have two mailboxes, one for company A another for company B. Our goal is to eliminate the user’s O365 mailboxes and end up only with company A mailbox. Our plan is the following:
-Configure company B users Outlook application to connect to company A mailbox
-Export O365 mailbox to PST file
-Import PST file content to Company A mailbox
The problem with this plan is that O365 doesn't offer a native and efficient way to perform multiple exports of mailboxes to PST files. I am currently evaluating an export of a mailboxes using "MessageOps Exchange Migrator" application but this solution only exports a mailbox at a time and it has been running 3 hours to export a 5GB mailbox. The average size of company B mailboxes is 5GB therefore I would like to find a better solution even if it is a paid solution (software or solution vendor doing the work for us) so that the exports of 380 mailboxes can be performed over a weekend (Friday evening, Saturday and Sunday). Hope somebody in this forum can provide a better approach or paid software solution to achieve this goal.