How to increase attachemnt size limit in Outlook 2010.

 

Outlook 2010’s attachment limit

 
        With Outlook 2010, the maximum size of an attachment has been set to 20MB. When you try to add a file which is larger than 20MB, Outlook will give you an error and will not allow you to add the attachment. This is in order to prevent the message from becoming stuck in the Outbox and to prevent you from needlessly uploading such a large attachment.

Increasing the limit

Note: Below mentioned step is registry tweak please backup your registry before performing below steps and be careful while handling registry. 

 
If your ISP allows for larger or smaller attachments and you want Outlook to match this limit, then you can increase or decrease this limit via a Registry tweak. If you are connecting to an Exchange server, then you do not need to modify anything as Outlook automatically modifies the limit then to the set limit configured on the Exchange server.

The setting is stored in the following location in the Registry;

Key: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
Value name: MaximumAttachmentSize
Value type: REG_DWORD

The value that you need to use is in KB. So if you know the amount of MB supported by your ISP, then you need to multiply that by 1024 to get the value that you need to enter. To allow for an unlimited size, you can set the value to 0.

Examples;
2MB-> 2048
5MB-> 5120
10MB-> 10240
50MB-> 51200

These steps can be followed Windows XP and Windows 7. 

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