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You want this to be enabled on all users.. In that case you can do it in organizational level<br />
<br />
Open EMC &gt;&nbsp;Global settings &gt;&nbsp;message deleivery &gt;&nbsp;property &gt;&nbsp;default Tab you ca see the option<br />
<br />
If you wna to do it user wise.. simple as follows<br />
<br />
On ADUC(dsa.MSC) where EMC or Exchange installed search for user and open property page&gt; exchange General &gt;&nbsp;Storage limit.... increase as u required...
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You want this to be enabled on all users.. In that case you can do it in organizational level

Open EMC > Global settings > message deleivery > property > default Tab you ca see the option

If you wna to do it user wise.. simple as follows

On ADUC(dsa.MSC) where EMC or Exchange installed search for user and open property page> exchange General > Storage limit.... increase as u required...

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Hello experts,<br />
<br />
A user in our Exchange 2003 needs to send emails more than 5MB size. But when he is trying such a message, he is getting a bounce message that he has exceeded the quota. <br />
<br />
How to change the quota for sent items?
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Hello experts,

A user in our Exchange 2003 needs to send emails more than 5MB size. But when he is trying such a message, he is getting a bounce message that he has exceeded the quota. 

How to change the quota for sent items?

Changing the default value for maximum sent message size in Exchange 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.