By design Microsoft places a limit to the number of Outlook Rules that can be created. This limit is the size it takes to store the rules itself and varies on different versions.
Make sure any paths to rules and rule names are kept to a minimum and try and combine rules where possible.
Avoid the limitations of Outlook rules and use FileChimp to process messages dynamically based on the content within the subject line. There is no known limit to the number of rules or combinations you can create and as FileChimp matches part of the subject line to a folder name the possible number of successfully matched and moved is unlimited.
Read more about Outlook Rule limitations here –
