Age limit for migration to Office 365 Exchange Online

We did a cut-over migration from on-premises Exchange 2003 to Exchange Online about 3 months ago. I just noticed my “sent folder” has history that only goes back 3 years. Were emails older than that excluded from the migration or has some age policy kicked in and vaporized those items?
Is there any way to get those back - short of rebuilding an older server and recovering from a backup?
FYI: I have no archive folders in my Outlook.
Thanks,
Jerry
jinfeldPresidentAsked:
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Vasil Michev (MVP)Connect With a Mentor Commented:
There are no such restrictions. The only items that will be skipped are the ones larger than 35MB, and the ones in the dumpster.

First of all, check if the messages are visible in OWA. If you are using Outlook 2013, check the setting for the 'cached mode slider', it's configured to only download messages from the last year by default. Outlook will show 'there are more items online' message in such cases.

Another option is the archive mailbox. Have you activated the archive mailbox in the cloud? By default it will move all messages older than 2 years to the archive mailbox.
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jinfeldPresidentAuthor Commented:
Great idea to check OWA! There, my sent folder goes back to 2003! What a relief!!

I'm using Outlook 2010 and I can find no control for setting age limits for the cache. But, in searching for that I found this in Account settings:
Mail messages in this account are automatically moved to the Online Archive after: 2 years.
1) Is there a cache limit setting in Outlook 2010
2) How do I stop the population of that Online Archive?

Thanks!!!!
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jinfeldPresidentAuthor Commented:
Super quick and thoughtful support!
Thanks!
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Vasil Michev (MVP)Commented:
There is no such setting in Outlook 2010, only some filtering options.

To adjust the archive tag, right click on a folder, select Properties, Policy, and under Online Archive, you can change to Never move items to the archive. You can adjust this on a folder level or even on a single message level.

If your Online Archive is not visible in Outlook, you are probably missing some updates. Make sure you have run the desktop setup for Office 365. Check for any relevant updates for Outlook/Office, like updating to SP2. At the very least, have these installed:

http://community.office365.com/en-us/wikis/manage/updates-to-outlook-2010-and-outlook-2007.aspx
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