Microsoft Outlook has a new attachment size limit of 20 MB. If this doesn’t seem like a whole lot, or you are constantly getting this error “The attachment size exceeds the allowable limit.” it might be time to fix fix that. Here is how to increase the Outlook attachment size limit with a quick and easy registry hack.
Increase Attachment Size Limit for Outlook 2010
Before we get started here is an example of the error you might get if you try to attach an attachment that exceeds 20 MB.
Pretty annoying right? Well open up the Registry by going to the Start Search and type in regedit.exe and hit enter to load the Registry. You will need admin rights.
Then go to HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences and right click in the right pane and select New then DWORD (32-bit) Value from the content menu.
Give the new DWORD the name “MaximumAttachmentSize” without the quotes. The double click the MaximumAttachmentSize and put in the KB number for you maximum size. For example 51200 is 50 MB. Here is a handy KB to MB converter.
After you finish entering your KB amount go give it a try. From the picture below I can add a 20 MB file. Yes I now the limit is 20 MB but the file is a little bigger than that.. Anyways give it a try.
Now before you can send the super big attachment, you might want to make sure you reflect your mail server limit. Even though you can attach the larger file doesn’t mean it will send. To recover lost attachment and PST file items, you may check these outlook tips: Recover Outlook PST file