Browse Definitions :
Definition

IMAP migration (Internet Message Access Protocol migration)

This definition is part of our Essential Guide: Plan your Exchange migration to Office 365 with confidence

IMAP migration (Internet Message Access Protocol migration) is a way to move email services from existing non-Exchange email servers to later versions of Microsoft Exchange Server, Exchange Online or Office 365.

Administrators begin IMAP migrations using the Exchange Administration Center or the Exchange Management Shell, which allow user mailbox content to migrate from an IMAP system to new Exchange mailboxes.

An IMAP migration process varies depending on which product is used -- since there is no one single IMAP server-- but the overall process for IMAP migrations to a cloud-based email service begins with the Exchange administrator obtaining the full name of the IMAP email server. Next, the admin uses a tool like Excel to create a CSV file containing details of each email account to be migrated, though the actual formatting will vary depending on the IMAP system. Then the admin establishes a connection between the source email server and the destination email system.

After the IMAP migration is complete, the administrator can redirect email messages directly to the new server, and then delete the migration batch to stop synchronization. At this point, the new email system is operational and the admin can stop the old email server.

An IMAP migration takes several hours to several days depending on the number of mailboxes, batch sizes and the amount of content in each mailbox.

Email messages larger than 35 megabytes cannot be migrated, and only up to 500,000 items per mailbox can be transferred.

To make an IMAP migration faster, the administrator can increase connection limits to the IMAP server and users can delete old email content prior to the migration. The administrator also can organize the IMAP migration with small, focused batches of mailboxes.

A staged (partial) migration is advisable when migration involves a larger number of mailboxes, or the process must be performed incrementally using smaller mailbox groups. Later versions of Exchange email servers must use cutover migration. This type of migration is limited to Exchange deployments of 1,000 mailboxes, or use hybrid deployments, which allow local and online deployments to coexist until administrators can organize migrations.

This was last updated in December 2015

Continue Reading About IMAP migration (Internet Message Access Protocol migration)

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

In your IMAP migration, are you moving your mailboxes to a cloud-based service or an on-premise Exchange server?
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • compliance audit

    A compliance audit is a comprehensive review of an organization's adherence to regulatory guidelines.

  • regulatory compliance

    Regulatory compliance is an organization's adherence to laws, regulations, guidelines and specifications relevant to its business...

  • Whistleblower Protection Act

    The Whistleblower Protection Act of 1989 is a law that protects federal government employees in the United States from ...

SearchSecurity

  • RSA algorithm (Rivest-Shamir-Adleman)

    The RSA algorithm is the basis of a cryptosystem -- a suite of cryptographic algorithms that are used for specific security ...

  • remote access

    Remote access is the ability to access a computer or a network remotely through a network connection.

  • IP Spoofing

    IP spoofing is the crafting of Internet Protocol (IP) packets with a source IP address that has been modified to impersonate ...

SearchHealthIT

SearchDisasterRecovery

  • network disaster recovery plan

    A network disaster recovery plan is a set of procedures designed to prepare an organization to respond to an interruption of ...

  • virtual disaster recovery

    Virtual disaster recovery is a type of DR that typically involves replication and allows a user to fail over to virtualized ...

  • tabletop exercise (TTX)

    A tabletop exercise (TTX) is a disaster preparedness activity that takes participants through the process of dealing with a ...

SearchStorage

  • enterprise storage

    Enterprise storage is a centralized repository for business information that provides common data management, protection and data...

  • disk array

    A disk array, also called a storage array, is a data storage system used for block-based storage, file-based storage or object ...

  • optical storage

    Optical storage is any storage type in which data is written and read with a laser. Typically, data is written to optical media, ...

Close