Error :- Outlook 2013 max file limit: “The file you’re attaching is bigger than the server allows.”

1. Close Outlook and open the Registry Editor (regedit.exe)
2. Depending on the Outlook version, go to:
   • Outlook 2013 — HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences
   • Outlook 2010 — HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
   • Outlook 2007 — HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Preferences
3. In this branch find and edit MaximumAttachmentSize value, specifying the new attachment limit, e.g., 102400 (100 MB). By default, it is 20 MB (20480 KB). To completely disable the limit, change this value to 0.

   Note. If there is no MaximumAttachmentSize key in this section, create it manually: New -> DWORD (32-bit)Value

4. Close the Registry Editor and restart Microsoft Outlook