Migration of 1,000 mailboxes per day
Frankfurt - Consultants of FirstAttribute AG faced an
interesting challenge during a migration project in the financial
How to migrate as many Exchange mailboxes as possible to a new
target environment within a few weeks?
Is it possible to migrate 1,000 mailboxes per
The project was realized with Dell / Quest Migration Manager for
Exchang and Multiple Agent Hosts.
The challenges of this Exchange migration were the
requirements of the customer, who wanted to migrate a large number
of mailboxes in a short rollout period. The project was launched
due to a provider change.
- Migration of 40,000 mailboxes to another Exchange
(Roll-out within 8 weeks)
- Interoperability between the two systems
- Transfer of all rights and delegations
- No restrictions for the end user
- Automated conversion of Outlook profile
Dell / Quest
Migration Manager for Exchange should be used as migration tool
for this project. To meet this requirement, it was necessary to
create a setting, which allows to convert at least 1,000
mailboxes per day.
The following architecture was part of the concept
FirstAttribute consultants created:
|○ QMM Console:
||Management interface and ADAM Database
|○ QMM DSA Server:
|○ QMM SQL Database:
||SQL Database on a shared SQL Server
|○ 4 QMM Source Agent Hosts:
||5 Mail-Source-Agents and 5 Mail-Transfer-Agents were provided
for each Source Agent Host
|○ 4 QMM Target Agent Hosts:
5 Mail-Target-Agents and 5 Calendar-Sync-Agents were provided
for each Target Agent Host
Architecture of the migration
The 1,000 mailboxes per day were distributed in four
Rollout groups to reduce the dependencies to a minimum.
The synchronization of the data of each mailbox began 7 days before
the conversion. To ensure a high data throughput, the distribution
was split to 20 QMM mail-source agents and 20 QMM mail target
agents (parallelization). With a lead time of 7 days, the roll out
was running with an average of 4,000 mailboxes in the
synchronization. As a result, only a few changes had to be
transferred at the transition date, the Source mailbox had to be
disabled and the target mailbox to be enabled.
The user was advised in a last e-mail that his mailbox has been
moved. In that email, the user is asked, to run a program, which
closes Outlook and switches the users Outlook profile automatically
to the target environment. In this way, a lot of migrations per day
were possible and it was ensured that the end users only had a
brief interruption during their working time.
In addition, 20 Calendar Synchronization Agents distributed on 4
Agent Hosts enabled all 40,000 mailboxes to synchronize all
calendars at the same time as well.
Schematic Rollout Plan
(SW= Mailbox Switch)
By parallelizing the mailbox export and import
functions on 8 servers with a total of over 60 agents and
the organizational division during the rollout to multiple
"migration waves" per day, all requirements have been met. All
40,000 mailboxes have been migrated within the given 8 weeks.
⇒ It is possible to migrate 1,000 mailboxes per day with Dell /
Quests Migration Manager for Exchange.
Do you need support for the planning or realization of your Exchange Migration?
Please contact us if you would like to know more.
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