Best 3rd Party Tool for exporting Exchange 2003 Mailboxes over 20GB

You can export using exmerge (https://gallery.technet.microsoft.com/office/Guide-to-Use-Exmerge-to-fd00af49) and import using mailboximportrequest cmdlet: https://technet.microsoft.com/en-us/library/ff607310(v=exchg.150).aspx

Hi Thombie

once a while i was also got struct in such a situation. I have a to export mailboxes of size 52GB. I decided to proceed with PowerShell. But what i observed is its taking a lot time to perform the operation. I don't have much time at that time so i cancel the process and decided to go for third party tool. After searching a lot i have found Systools Exchange Recovery Software.

I Purchased the software, that works fine for me. Hope it will work for you

Thanks & Regards
Dexter

Definitely recommend MigrationWiz from my end, it can do it all. Have used it for numerous Exchange 2013 and Office 365 migrations without issues: https://www.bittitan.com/products/migrationwiz/mailbox-migration

In hae used Migrationwiz  and its great. Can it  migrate from servers on the same site  ?

ExMerge is not suitable as it has a 2GB limit.  However, you could export the existing mailbox using it by selecting only portions of email to export (by date range, for example).  Alternatively, you could take an OST file and use a third party tool to convert it to a PST.  Or just manually copy the mail over in outlook to a PST.

Otherwise, some of the tools others have suggested could work.

Thanks  this worked.