Abstract: An end user application stores activity data in a part of an electronic document. When the electronic document is stored on a shared storage system, activity data is extracted and stored in an activity store. After activity data has been successfully stored in the activity store, the end user application can remove the activity data from the electronic document. In particular, the end user application can periodically query the activity store to identify activities that have been successfully stored in the activity store. By removing the activity data from the electronic document, the electronic document can be maintained at a reasonable size. By having the end user application remove the activity data, coherency of the data file, and consistency between local copies on end user computers and copies on the shared storage system, can be maintained.