If you’ve ever attempted to attach a large file to an email in Outlook file you’ve probably received a notification window alerting you that “The attachment size exceeds the allowable limit.” Even though it doesn’t tell you, the default file attachment limit in Outlook 2010 is 20 MB. What we’ll do in this How-to is change that limit to anything you want! However, keep in mind that your file attachment sizes will still be governed by the limits of your email service provider.
Click the Start Menu Orb, Type regedit into the search box and Press Enter.
Navigate to the following registry key:
Right-Click an empty area in the right-panel of the Preferences key and Select New > DWORD (32-bit) Value.
Right-Click the new MaximumAttachmentSize DWORD and Select Modify.
The number you put into the Value data box will tell Outlook how big of a file attachment to allow emails to send. This size is determined in kilobytes. Here are some common numbers you can put in.
- 0 = unlimited (any size)
- 1048576 = 1 Gigabyte
- 102400 = 100 Megabytes
- 51200 = 50 Megabytes
- 1024 = 1 megabyte
Now you can attach files of any size that you want to emails in Outlook 2010! There are two things to watch out for though. First off, sending a huge file can take a while unless you have a massive upload speed on your internet connection. And lastly, most email providers don’t support large file attachments, here are some common limits:
|Email Provider||Max Attachment size|
20 MB (50MB for premier)
Keep this in mind before you try to send a monstrous attachment to a buddy over at GMAIL.