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It was the answer in the end..it could help someone.
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It was the answer in the end..it could help someone.

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I have one out of 150 mailboxes in a cutover migration, where the <b>Recoverable Items</b> folder has grown to over 2.5 million (4 GB) items - It was 1.5 million early last week. &nbsp;The migration is effectively waiting on this single mailbox to complete but it seems to be growing so quickly that it may never catch up - but I am not sure as we have migrated 1 million of this mailbox's items to the cloud.<br />
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The sheer amount of messages seems to indicate that they aren't valid messages or items that the user is deleting in Outlook. &nbsp;He has only worked with the company for 2 years - it is highly unlikely that the user had that many messages/items.<br />
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Source Exchange is: SBS 2011 SP1<br />
Target: Exchange Online (Office 365)<br />
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Thank you in advance.<br />
K.B.
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I have one out of 150 mailboxes in a cutover migration, where the Recoverable Items folder has grown to over 2.5 million (4 GB) items - It was 1.5 million early last week.  The migration is effectively waiting on this single mailbox to complete but it seems to be growing so quickly that it may never catch up - but I am not sure as we have migrated 1 million of this mailbox's items to the cloud.

The sheer amount of messages seems to indicate that they aren't valid messages or items that the user is deleting in Outlook.  He has only worked with the company for 2 years - it is highly unlikely that the user had that many messages/items.

Source Exchange is: SBS 2011 SP1
Target: Exchange Online (Office 365)

Thank you in advance.
K.B.

Recoverable Items folder is growing during a cutover migration

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.