Large-Scale Email Migration With no Lost Data

How Credit Suisse, Harvard University and HP migrated millions of emails quickly, reliably and accurately

If you need to process less than 20 user accounts, please visit our regular “Email Migration” page.

Migrate Any Way You Like

Fast, Easy and Automated

Install Aid4Mail anywhere you like, and as many times as you need, to migrate your users quickly and efficiently. Deploy it on servers, end-user computers, USB flash drives, or a combination of the three: the choice is yours. You can also choose to use the following options to execute your email migration:


Console Launcher

Migrate your users 5x faster by processing multiple email accounts at once with the Aid4Mail Console Launcher.



Use the Aid4Mail Console for unlimited scripting, automation and integration possibilities.


Migration Partner

Find an experienced partner to assist with your migration.

Find a partner



Deploy and install the user-friendly Aid4Mail Wizard directly on each user’s computer so your users can migrate themselves.

Monitor Your Migration Remotely

Benefit from the convenience of a cloud-based solution, with the security of an on-premise migration tool.

  • Track your migration progress, no matter how or where you run Aid4Mail.
  • Login on your phone, tablet or computer for a full progress overview, even if you’re on the go.
  • Get instant statistics, resolve errors, and see how many sessions you have left. All from a single portal.

Here's Why You Should Choose Aid4Mail for Your Migration


Save time, with its fast conversion engine and automated processing options.


Total flexibility, install it on any number of servers, USB flash drives and computers.


Save money, thanks to its competitive pricing.
Skip to pricing »


Peace of mind, as it’s so accurate and reliable.


Satisfaction guaranteed, thanks to our speedy support and quick fixes if issues arise.


Data security assured, because you’re in complete control of your data.

Download our whitepaper Migrating Corporate Email: 7 Things to Look for in a Migration Tool to learn more about essential requirements for any migration solution.

Migrate 16,000+ Emails Per Account Every Minute

Install Aid4Mail this Friday afternoon, and by the time you return to the office on Monday morning, you could have as many as 45,000,000 emails migrated. Start by using this calculator to estimate your migration time…

Average processing speed:

(*) These tests were performed on a 5-year old PC with a Quad-Core Intel Xeon processor under the 64-bit edition of Windows 7 and the 32-bit edition of Outlook 2010. Internet speed was 75 Mbit/s for downloads and 7 Mbit/s for uploads.
DISCLAIMER: your results may vary significantly from ours. Many factors influence processing speed.

Supports 40+ Email Formats and All Popular Cloud Services

Migrate your email to Office 365 or G Suite (previously Google Apps), or to Outlook and Exchange. Aid4Mail is the ideal solution for large corporations, government agencies and universities.

With some customers migrating over 60,000 email accounts to Office 365, you can be sure Aid4Mail is a proven, enterprise grade email migration solution.

Is your messaging system not listed above? See all supported formats.

Aid4Mail is faster and more secure than cloud-based solutions

Migrating your mail from Outlook to Office 365, or from Thunderbird to G Suite (previously Google Apps)? An on-premise solution like Aid4Mail is faster and more secure than a cloud-based solution.

Aid4Mail Has Successfully Migrated Millions of Mailboxes Worldwide

Aid4Mail has been downloaded more than 100,000 times for small and large-scale needs. Built and supported in Switzerland, Aid4Mail is used in 120+ countries.


““Most of the conversions took less than half an hour. This meant the users were more willing to do the export and move to the new system as it didn’t mean too much time for them without their computer.”
– Maxime Callens, Médecins Sans Frontières          [ Read our MSF Case Study ]


“Aid4Mail is a spectacular product. I don't think people realize how hard it is to reliably convert email from one format to another, and then do it at scale the way you do. It really is quite an accomplishment.”
– Matt Coan, Sonian          [ Read our Sonian Case Study ]

Get a Consultation

Contact us for a no-obligation consultation. We can show you the program, discuss your needs and propose the right solution for you.

Just fill out our contact form and we’ll get back to you within 24 hours on business days. We look forward to hearing from you!

Contact Us   Or  Get Started Now With a Free Trial

Already Know Aid4Mail is Right For You?

Configure Your Pricing

* Minimum: 20 sessions. Usually, the quantity of sessions you need to get will match the number of email accounts you’ll migrate. But if the mail for a single account is stored in more than one location (e.g. offline archives), you’ll need to add enough sessions to cover those extra locations.

Or contact us for more information

  • Operating System : Aid4Mail runs under Windows 10, 8, 7, Vista, XP, 2000, Server 2016, 2012, 2008 and 2003 or Linux in conjunction with Wine. Both Windows 32-bit and 64-bit are supported.
    Windows NT4 / ME / 98 / 95 should work but are not officially supported.
  • Internet : Online license activation, validation, and re-activation require an internet connection (offline activation option available with Aid4Mail eDiscovery editions).
  • Hardware Requirements : 64 MB of RAM, 12 MB disk space. Pentium (or compatible) processor.


Aid4Mail can read mail from:

  • Microsoft Exchange through Outlook/MAPI (1) (except Aid4Mail Home) or IMAP (2),
  • Outlook Personal Storage files (1) (*.pst),
  • Outlook MSG files (1) (*.msg),
  • Outlook Express versions 5 and 6 (*.dbx, *.eml and *.nws),
  • Outlook Express version 4 (*.idx and *.mbx),
  • Windows Live Mail (*.eml;*.nws),
  • Windows Mail (Vista mail client),
  • IMAP accounts,
  • Webmail services that offer IMAP access, e.g. Gmail, Yahoo! Mail, Amazon WorkMail, FastMail, GMX Mail,, Outlook 365, etc.,
  • Mozilla Thunderbird mailbox files,
  • SeaMonkey mailbox files,
  • Netscape mailbox files,
  • Apple Mail ( message files (*.emlx),
  • Qualcomm Eudora mailbox files (*.toc and *.mbx),
  • Eudora OSE mailbox files,
  • Macintosh Eudora mailbox files,
  • Google Takeout files (*.mbox),
  • Google Vault files (*.mbox),
  • Generic mailbox files (mbox, Entourage MBOX, Evolution, Berkeley mail, BSD mail, Unix mail format),
  • EML message files (*.eml),
  • MHT Web Archive files (*.mht),
  • Pegasus mailbox files (*.pmi, *.pmm, and *.cnm),
  • The Bat! mailbox files (3) (*.msb and *.tbb),
  • PocoMail mailbox files (*.idx, *.idb, and *.mbx),
  • Barca mailbox files (*.idx, *.idb, and *.mbx),
  • FoxMail mailbox files up to version 6.5 (*.box),
  • Opera mailbox files (*.mbs),
  • Calypso and Courier archive files,
  • Forte Agent mailbox files (*.idx),
  • Pine mbox files (with limited “From ” escaping),
  • PMMail message files (*.msg),
  • Maildir folders (local copies),
  • MSN Mail v8 (*.MailDB),
  • Mailbag Assistant mailbox files (*.mbg),
  • E-mail Examiner mailbox files (*.pmx),
  • Aid4Mail ZIP archives (*.zip).

Aid4Mail can export/save mail to:

  • Microsoft Exchange through Outlook/MAPI (1) (except Aid4Mail Home) or IMAP (2),
  • Outlook Personal Storage files (1) (*.pst),
  • Outlook MSG files (1) (*.msg) – only if source mail comes from Microsoft Exchange or Outlook files,
  • Windows Live Mail,
  • Windows Mail (Vista mail client),
  • IMAP accounts,
  • Webmail services that offer IMAP access, e.g. Gmail, Yahoo! Mail, Amazon WorkMail, FastMail, GMX Mail,, Outlook 365, etc,
  • Mozilla Thunderbird mailbox files,
  • SeaMonkey mailbox files,
  • Eudora OSE mailbox files,
  • Netscape mailbox files,
  • PocoMail mailbox files (*.mbx),
  • Barca mailbox files (*.mbx),
  • Generic mailbox files, (mbox, Entourage MBOX, Evolution, Berkeley mail, BSD mail, Unix mail format),
  • EML message files (*.eml),
  • XML files (*.xml),
  • Plain text files (*.txt),
  • MHT Web Archive files (*.mht) - linked from an HTML index page or an MS Excel Workbook file (not available in Aid4Mail Home),
  • MHT files with tab-delimited data file for import into a database (not available in Aid4Mail Home),
  • Adobe Acrobat PDF files (not available in Aid4Mail Home),
  • Aid4Mail ZIP archives (*.zip).


  1. To process (from/to) Outlook MSG files, PST files, and Outlook/MAPI mail profiles, Aid4Mail requires either a 32-bit version of Office Outlook or a standalone version of MAPI. For details, free options, and limitations, see the System Requirements.
    Only Aid4Mail Console can export a source MAPI profile or PST file to a target MAPI profile or PST file. With Aid4Mail Home, Aid4Mail Professional, and Aid4Mail eDiscovery, the workaround is to first export your emails to the Outlook MSG format, and then re-export those files to your target format.
  2. Microsoft Exchange can either be processed through an Outlook/MAPI mail profile (1), or through the IMAP protocol in which case the Exchange server needs to be set up for IMAP access (see instructions).
  3. Aid4Mail cannot process encrypted The Bat! mail files. In this case, you will first have to export your messages with The Bat! to a Generic mailbox format, which Aid4Mail can then process to any of the supported formats.
  4. Aid4Mail currently does not offer tools to convert address books, filters, or account settings from one format to another.