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John Speare, Senior Technical Writer, Microsoft
This wiki post has fixes and tips to help you migrate from third-party email solutions to Microsoft Office 365.
If you plan to migrate an enterprise-level Google Apps solution to Office 365, you may be able to use the IMAP migration tool to move your email. But more complex user identity and document management migrations may benefit from the help of third-party companies that specialize in migration. We’re not making any recommendations, but here are a few of those companies:
I’ve migrated a portion of my Lotus Notes users to the cloud. My on-premises users are getting the dreaded winmail.dat attachment. How do I fix this?
Specify your on-premises (Lotus Notes) domain as a remote domain in Exchange Online. You must then configure the remote domain to disable Transport Neutral Encapsulation Format (TNEF) for all email that is sent to that domain.
Want to learn more? See Manage TNEF Message Formatting with Remote Domains.
Tips for global address list (GAL) sharing:
Tips for mailboxes that have not been migrated don’t appear in the Exchange Online GAL:
The format for this attribute is SMTP:emailAddress; for example, SMTP:email@example.com.
Directory synchronization and source of authority
Cutover Exchange Migration and Single Sign-On