priv.edb exceeded 16GB

I am new to exchange server.
We have an exchange server (5.5) that is used to send our company newsletters and now it has stopped responding. The event log tells me that the databases has reached it maximum size (16GB). I used to access this mail box from another computer using Microsoft outlook but then now I cannot open that - I get this error : "The microsoft exchange server computer is not available. Either there are network problems or the microsoft exchange server computer is down for maintenance"

Can you please help me with this, The mails are not important at all since they are all bounced mails and system errors.
Do you think it is a good idea to just delete the priv.edb since I do not care if the emails are lost ?how can I solve this issue? please advise
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Exchange will unmount your information store when it reaches 16GB.  Don't delete priv.edb.

Do a Exchange defrag to let it go down a bit under 16GB, then use outlook to open up and clean up your mailbox.  Once you done that, defrag again.

I am not sure if 5.5 can temp. incrase the size...

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webQAuthor Commented:
Is there any way that I can delete all the emails using Exchange?
You can use Exchange System Management to delete that user's mailbox, and then you still need to defrag Exchange store or else you won't get the space back.
webQAuthor Commented:
Can you tell me how exactly I can use the Exchange System Management to delete the emails. I do not want to delete the mailboxes but I want to delete the mails in the mailboxes.
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