The Webmail client provides several methods for categorizing email messages. You can use these along with the Search feature to quickly locate and retrieve messages. Methods you can use are as follows.
Folders. You can create folders to organize your messages and you can move mail from one folder to another, for example taking a mail out of a "To Do" folder and moving it to a "Done" folder.
Filters - (Advanced Plan and Pro Accounts only). In your Preferences, Mail Filters tab, you can create rules for classifying inbound mail according to items in the subject line, sender, recipient, or other characteristics.
Tags. - (Advanced Plan and Pro Accounts only). You can use tags as labels on email messages and then use the Search feature to show all mail with a certain tag.
Conversations. - (Pro Accounts only). You can have messages grouped by conversation. This built-in feature automatically groups all sent and received email messages with the same subject into a single conversation.
You can create shortcut keys from yourPreferences -> Shortcutstab for mail, saved searches, and tags...
Folders. You can create folders to organize your messages and you can move mail from one folder to another, for example taking a mail out of a "To Do" folder and moving it to a "Done" folder. You cannot create folders in Webmail Mobile but you can move files to folders that have already been created.
Tags. You can use tags as labels on email messages and then use the Search feature to show all mail with a certain tag. Tags will have to be created and assigned to messages in either the Plus or Lite versions of Webmail initially.