Your company is planning to migrate to Microsoft Exchange Online. The company employs 5,000 people, each
with a mailbox currently located on Exchange Server 2000.
The company has the following migration requirements:
Move mailboxes in batches.
Do not migrate calendar or contact items.
Provide migration status reports to administrators.
You need to select the appropriate migration strategy.
Which migration strategy should you use?

A.
Staged migration

B.
Cutover migration

C.
IMAP migration

D.
Hybrid migration

Explanation:
The only migration method supported for Exchange Server 2000 mailboxes is an IMAP migration.
In an IMAP migration, the contents of users’ mailboxes on an IMAP messaging system are migrated to their
Exchange Online mailboxes. Here are some requirements and considerations for using an IMAP migration:
https://technet.microsoft.com/en-us/library/jj874015(v=exchg.150).aspx