2003 and 2007 with Unicode pst format support unlimited items per folder.
The max message store is 20 GB by default (controlled by a reg entry) - can
be increased.

ANSI (old pst format) is limited to 2 GB pst and no more than 64,000 items
per folder, depending on the version of outlook the pst was created in (can
be as low as 16,000 items)

items = messages, contacts etc, subfolders, published forms, hidden items.


--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/
Outlook 2007: http://www.slipstick.com/outlook/ol2007/

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"Brian Tillman" wrote in message
...
wrote:

Is there a limit in the number of email that Outlook 2007 can contain
in a single folder?

Every folder can contain at a minimum 64K items (size doesn't matter) and
the entire data store can contain at a minimum 20GB.
--
Brian Tillman