MS Exchange Server 2010

I am using  MS Exchange Server 2010 in my company. now i have problem that one user he has large sizes two emails in his INBOX. if he try to send/receive through outlook it will stuck and keep trying to download.
Then i login to MS Outlook Web App and try to delete these emails from there but it give error message "some items can not delete". I can not delet or move or remove.

Please help me to delete these emails from INBOX.

thanks
nainasipraAsked:
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1ly4meCommented:
Try to find out the email size, and set or increase message limits in exchange 2010.
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