All you want to know about Office 365 in the Other region / Middle east region – Information is wealth ……… Share it! ……… PREMNAIR
Exchange Online coexistence options Not all companies are ready to dive right into a hosted environment. Depending on your comfort level, you can run a hybrid/coexistence environment. And there are various levels to choose from in this option: simple coexistence or rich coexistence.
Once you’ve decided to make the switch to Office 365, there are two different migrations processes depending on which platform you’re running.
If you choose the Exchange migration plan, you can migrate an existing Exchange 2003, Exchange 2007 or Exchange 2010 environment to Office 365. This option is also called a “simple Exchange migration” or a “cutover migration” because you move all on-premise applications.
You should use the IMAP migration plan if you need to migrate IMAP-enabled servers, including Exchange 5.5 and Exchange Server 2000, to Office 365
 CUTOVER MIGRATION
Migrate All Mailboxes to the Cloud – E-mail Migration in the Exchange Control Panel to migrate all the mailboxes and corresponding mailbox data from Microsoft Exchange to your cloud-based e-mail organization. This type of migration is called a cutover migration because all on-premises mailboxes are migrated in preparation for moving your entire e-mail organization to the cloud.
When you migrate Exchange mailboxes to the cloud in a cutover Exchange migration:
When you’re ready, you can route e-mail directly to the cloud-based mailboxes and delete the migration batch. Then you can remove your on-premises Exchange organization if you want.
Important NOTE: If you’ve activated and installed the Microsoft Online Services Directory Synchronization tool, you can’t run a cutover Exchange Migration. If you’ve installed the directory synchronization tool, you can deactivate directory synchronization and then run a cutover Exchange migration.
 STAGED MIGRATION
 HYBRID MIGRATION