Outlook 2007 not Syncing with Exchange

I have a client site that utilizes Office 365 for their email services.  A couple of users are experiencing an issue with their Outlook 2007 not syncing properly with the Exchange server.  It is not allowing access to send/receive email and their folders are not updating and staying current.  What would cause Outlook not to sync with Exchange and how would you resolve the issue?
ebsadminAsked:
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Vasil Michev (MVP)Commented:
Make sure they have all the needed updates installed; rerun the Office 365 desktop setup on the affected machines and recreate the Outlook profile.

Here is the list of all needed updates:

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

Just to exclude any possible issue with the actual mailboxes, try them on another machine, with another version of Outlook or via the webmail.
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