One of the first steps in preparing for an Office 365 migration is running a tool we provide called IDFix. The goal of this tool is to help minimize identity issues when migrating to the cloud. Most identity issues come down to two issues:
- Invalid characters in key attributes
- User objects with duplicate values in indexed attributes (duplicate objects)
The first issue is pretty easy to deal with–IDFix will identify objects with offending characters and the attributes where they exist, and will even make some recommendations. The second issue, however, is most tricky. Let’s say you have a report that you have two or three objects that have overlapping properties:
- Mail-enabled Contact (MEC) with an SMTP address of [email protected]
- Mail-enabled User (MEU) with a UPN of [email protected]
- Mailbox-enabled User
Read more at source: https://blogs.technet.microsoft.com/undocumentedfeatures/2016/07/08/how-to-merge-duplicate-mail-enabled-user-and-contact-objects/
