An IMAP migration is designed primarily for situations in which mailboxes are migrated from a non-Exchange mail system to Office 365. The second type supported by Microsoft is an IMAP migration. If the users have excessively large mailboxes, then a cutover migration might take an unacceptable amount of time to complete.
However, cutover migrations might not always be the best choice, even for small organizations, because the migration must be completed all at once. Cutover migrations are designed to be easy, but can only be used in Exchange Server organizations with less than 1,000 mailboxes. Microsoft supports three primary migration types. In reality, only the smallest organizations can get away with these simplified migrations. Some of the marketing hype surrounding Exchange Server migrations to Office 365 might lead you to believe the migration process can be completed in six easy steps. Perhaps the single-most-important thing you can do to ensure a smooth migration to Office 365 is to choose an appropriate migration method. Needless to say, the potential exists for things to go wrong during the migration process.įortunately, there are some things you can do to hedge your bets and improve your chances of a smooth migration.ġ. Even the cutover migration method, which is designed to be relatively easy, requires extensive planning. The Exchange Online offering in Office 365 is much easier to manage, eliminates the capital cost associated with running the Server edition and the management overhead associated with it.Īt the same time, anyone who has performed an Exchange Server to Office 365 migration will tell you doing so is a complex undertaking. If the above method can no longer be used you can use ADSIEdit to remove the SCP manually.Many organizations are gravitating to the lure of giving up running Exchange Server in favor of turning it over to Microsoft Office 365. The easiest way to change this is using Powershell to change the AutoDiscoverServiceInternalUri to NULL: Set-ClientAccessServer –Identity SERVERNAME -AutoDiscoverServiceInternalUri $null This XML file is located in the AutoDiscoverServiceInternalUriĬheck the AutoDiscoverServiceInternalUri Get-ClientAccessServer |select AutoDiscoverServiceInternalUri Solution 1 Powershell When this fails Outlook falls back to the next DNS based methods or uses a local XML file.
Most of the time, this doesn’t work for the internal users, because Outlook is hard-coded to query an AD Service Connection Point (SCP) to locate a server with the Autodiscover service You need to change your internal and external Autodiscover DNS setting.
When Migrating to Office 365 you need to reconfigure your Outlook profile.
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