Storing Message Filters in the Cloud would make handling message filters between different devices a lot easier. Ideally, users might select the cloud option of their choice like Google Drive or Microsoft OneDrive, etc.
With cloud message filters, changes made to a message filter profile on one computer would update across all the computers that have message filters pointing to that cloud file. No more BS with importing and exporting filters on different computers that are quickly out of date and with different versions... All TBirds would have the same filter and one would not have to look around for emails that were stored in different places because of different filter settings...