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On Demand Migration for Email Current - User Guide

Introduction Preparing Migrations Test and Pilot Migrations Configuring and Running Migrations Post Migration Third Party Assessments and Certifications Glossary

POP/Windows Live Hotmail

Error Description/Resolution
Invalid mailbox (Unable to retrieve folders): authentication failed. Either the test mailbox you entered does not exist or you typed an incorrect password.
Invalid Mailbox (Unable to retrieve folders): The requested name is valid, but no data of the requested type was found. The Server name and/or port number are incorrect.

IMAP

Note: Error messages may vary depending on the IMAP server you are connecting to.

Error Description/Resolution
LOGIN Failure Invalid password
Invalid login or password

Invalid login or password

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. Invalid Port Number
No Such Host Invalid server address

Zimbra

Error Description/Resolution
Invalid Mailbox (Unable to retrieve folders): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond <IP address>:<port number>. Incorrect IMAP address/port
Invalid Mailbox (Unable to retrieve folders): AUTHENTICATE failed Incorrect IMAP admin username/password
Invalid Mailbox (Unable to retrieve folders): Failed to connect to server <IP address> on admin port <port number> as user root. Unable to connect to the remote server Incorrect SOAP address/admin port
Invalid Mailbox (Unable to retrieve folders): Unable to connect to the remote server Incorrect SOAP port
Invalid Mailbox (Unable to retrieve folders): Failed to connect to server <IP address> on admin port <port number> as user root2. Exception of type 'Zimbra.Client.ZimbraException' was thrown. Incorrect SOAP username/password
Invalid Mailbox (Unable to retrieve folders): Failed to connect to server <IP address> on admin port <port number> as user root. The underlying connection was closed: An unexpected error occurred on a receive Incorrect SOAP Admin or Port SSL setting
Invalid Mailbox (Unable to retrieve folders): Tried to read a line. Only '' received. Incorrect IMAP SSL setting

Adding Mailboxes

After connecting to your source and target email service, the next step is to list the mailboxes you want to migrate. This is done in the Mailboxes tab.

 

Note: If you haven’t already done so, set up the mailbox accounts in the target email service. On Demand Migration for Email does not create target mailboxes during a migration. Also, you cannot add mailboxes until you have successfully connected to your source and target email service.

You can add the mailboxes you want to migrate manually, or in the case of a large migration, you can import a TSV file which lists each mailbox. If you selected the option Use end-user credentials when connecting to either the source or target email service, you must specify the passwords for each mailbox.

Be aware that if you import TSV file, this will overwrite any mailboxes that have already been added, whether manually or through a previously imported TSV file.

Supported mailbox types

This table lists mailbox types migrated by On Demand Migration for Email.

Source User mailbox Shared mailbox Resource mailbox* Group mailbox
G Suite      
Exchange 2007/2010/2013/2016/2019
*Migration from Exchange 2010, 2013, 2016, and 2019		  
Microsoft 365  
Sun ONE/iPlanet      
Zimbra      
IMAP      
POP/Hotmail      

Resource mailboxes for Exchange and Microsoft 365 are used for reserving and coordinating rooms and equipment.

Dealing with large mailboxes

Mailboxes that added to a migration plan are migrated in parallel as described in Connecting to Email Services. However, contents of each individual mailbox are migrated subsequently, item by item. That may cause decreased migration performance for large mailboxes.

To make the migration faster for a large mailbox, you can split the mailbox's contents into several parts by time when message is created or received and then migrate each part in a separate migration plan.

To do that, take the following steps:

  1. Approximately estimate the time period of messages within the mailbox by finding the oldest message and the newest.
  2. Split the estimated time period into several shorter time intervals. Note that each time interval must have a one-day overlap with the neighbor time intervals to avoid data loss.
  3. For each time interval create a separate migration plan. Note that each migration plan should use its own pair of source and target administrative accounts.
  4. Add the mailbox to all of these migration plans.
  5. On the Options page of each migration plan under Date Range select Choose Date Range and specify the corresponding time interval.

 

Important: In case of migration to Microsoft 365, it is not recommended to have more than 4 migration plans processing the same mailbox in parallel due to Microsoft 365 throttling limitations. Otherwise, the The server cannot service this request right now. Try again later. Waiting 5.00 minutes before resuming errors may repeatedly occur decreasing an overall migration speed.

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