IIRC when we migrated if you have a maximum message size it also refuses to move those, we had to disable those during the move window - I think the issue was that it uses SMTP as the transport.
From: Michael B. Smith [mailto:mich...@smithcons.com] Sent: 06 June 2012 15:52 To: MS-Exchange Admin Issues Subject: RE: Migrating big mailboxes from 2003 to 2010 No, not really. Be aware that 2010 has a default maximum mailbox size of 2 GB, so you will need to adjust that before starting your moves. Sent from my Windows Phone ________________________________ From: Al Rose Sent: 6/6/2012 10:25 AM To: MS-Exchange Admin Issues Subject: Migrating big mailboxes from 2003 to 2010 Hi, Are there any restrictions on mailboxes size in regard to migration scenario? We are planning to migrate from Exchange 2003 to 2010 and we have users with 10Gb mailboxes. Thanks --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com<mailto:listmana...@lyris.sunbeltsoftware.com> with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com<mailto:listmana...@lyris.sunbeltsoftware.com> with the body: unsubscribe exchangelist -- MIRA Ltd Watling Street, Nuneaton, Warwickshire, CV10 0TU, England Registered in England and Wales No. 402570 VAT Registration GB 100 1464 84 The contents of this e-mail are confidential and are solely for the use of the intended recipient. If you receive this e-mail in error, please delete it and notify us either by e-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the e-mail as this is prohibited. --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist