Our platform provider, Salesforce.com, automatically archives Activities (including email) when they are over 365 days old. Please see the links below for more details on this topic.
Help Links
- See the following documentation provided by Salesforce.com regarding Archived Activities. This documentation explains the Archive process in great detail:
https://help.salesforce.com/HTViewHelpDoc?id=activities_archived.htm&language=en_US
- Follow these instructions if you would like to request for Salesforce.com to increase the number of days before archiving your Activities and Email:
https://help.salesforce.com/HTViewSolution?id=000175889&language=en_US